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KVM/arm updates for Linux v5.1 

- A number of pre-nested code rework
 - Direct physical timer assignment on VHE systems
 - kvm_call_hyp type safety enforcement
 - Set/Way cache sanitisation for 32bit guests
 - Build system cleanups
 - A bunch of janitorial fixes
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Merge tag 'kvmarm-for-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into kvm-next

KVM/arm updates for Linux v5.1

- A number of pre-nested code rework
- Direct physical timer assignment on VHE systems
- kvm_call_hyp type safety enforcement
- Set/Way cache sanitisation for 32bit guests
- Build system cleanups
- A bunch of janitorial fixes
This commit is contained in:
Paolo Bonzini 2019-02-22 17:45:05 +01:00
parent 8f060f5355 c88b093693
commit 71783e09b4
33 changed files with 915 additions and 390 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
MAINTAINERS
View File

@ -8304,29 +8304,25 @@ S: Maintained
F: arch/x86/include/asm/svm.h
F: arch/x86/kvm/svm.c
KERNEL VIRTUAL MACHINE FOR ARM (KVM/arm)
KERNEL VIRTUAL MACHINE FOR ARM/ARM64 (KVM/arm, KVM/arm64)
M: Christoffer Dall <christoffer.dall@arm.com>
M: Marc Zyngier <marc.zyngier@arm.com>
R: James Morse <james.morse@arm.com>
R: Julien Thierry <julien.thierry@arm.com>
R: Suzuki K Pouloze <suzuki.poulose@arm.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
L: kvmarm@lists.cs.columbia.edu
W: http://systems.cs.columbia.edu/projects/kvm-arm
T: git git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git
S: Supported
S: Maintained
F: arch/arm/include/uapi/asm/kvm*
F: arch/arm/include/asm/kvm*
F: arch/arm/kvm/
F: virt/kvm/arm/
F: include/kvm/arm_*
KERNEL VIRTUAL MACHINE FOR ARM64 (KVM/arm64)
M: Christoffer Dall <christoffer.dall@arm.com>
M: Marc Zyngier <marc.zyngier@arm.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
L: kvmarm@lists.cs.columbia.edu
S: Maintained
F: arch/arm64/include/uapi/asm/kvm*
F: arch/arm64/include/asm/kvm*
F: arch/arm64/kvm/
F: virt/kvm/arm/
F: include/kvm/arm_*
KERNEL VIRTUAL MACHINE FOR MIPS (KVM/mips)
M: James Hogan <jhogan@kernel.org>

4
arch/arm/include/asm/arch_gicv3.h
View File

@ -54,7 +54,7 @@
#define ICH_VTR __ACCESS_CP15(c12, 4, c11, 1)
#define ICH_MISR __ACCESS_CP15(c12, 4, c11, 2)
#define ICH_EISR __ACCESS_CP15(c12, 4, c11, 3)
#define ICH_ELSR __ACCESS_CP15(c12, 4, c11, 5)
#define ICH_ELRSR __ACCESS_CP15(c12, 4, c11, 5)
#define ICH_VMCR __ACCESS_CP15(c12, 4, c11, 7)
#define __LR0(x) __ACCESS_CP15(c12, 4, c12, x)
@ -151,7 +151,7 @@ CPUIF_MAP(ICH_HCR, ICH_HCR_EL2)
CPUIF_MAP(ICH_VTR, ICH_VTR_EL2)
CPUIF_MAP(ICH_MISR, ICH_MISR_EL2)
CPUIF_MAP(ICH_EISR, ICH_EISR_EL2)
CPUIF_MAP(ICH_ELSR, ICH_ELSR_EL2)
CPUIF_MAP(ICH_ELRSR, ICH_ELRSR_EL2)
CPUIF_MAP(ICH_VMCR, ICH_VMCR_EL2)
CPUIF_MAP(ICH_AP0R3, ICH_AP0R3_EL2)
CPUIF_MAP(ICH_AP0R2, ICH_AP0R2_EL2)

8
arch/arm/include/asm/kvm_emulate.h
View File

@ -265,6 +265,14 @@ static inline bool kvm_vcpu_dabt_isextabt(struct kvm_vcpu *vcpu)
}
}
static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
{
if (kvm_vcpu_trap_is_iabt(vcpu))
return false;
return kvm_vcpu_dabt_iswrite(vcpu);
}
static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
{
return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;

53
arch/arm/include/asm/kvm_host.h
View File

@ -26,6 +26,7 @@
#include <asm/kvm_asm.h>
#include <asm/kvm_mmio.h>
#include <asm/fpstate.h>
#include <asm/smp_plat.h>
#include <kvm/arm_arch_timer.h>
#define __KVM_HAVE_ARCH_INTC_INITIALIZED
@ -56,10 +57,13 @@ int __attribute_const__ kvm_target_cpu(void);
int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
struct kvm_arch {
/* VTTBR value associated with below pgd and vmid */
u64 vttbr;
struct kvm_vmid {
/* The VMID generation used for the virt. memory system */
u64 vmid_gen;
u32 vmid;
};
struct kvm_arch {
/* The last vcpu id that ran on each physical CPU */
int __percpu *last_vcpu_ran;
@ -69,11 +73,11 @@ struct kvm_arch {
*/
/* The VMID generation used for the virt. memory system */
u64 vmid_gen;
u32 vmid;
struct kvm_vmid vmid;
/* Stage-2 page table */
pgd_t *pgd;
phys_addr_t pgd_phys;
/* Interrupt controller */
struct vgic_dist vgic;
@ -147,6 +151,13 @@ struct kvm_cpu_context {
typedef struct kvm_cpu_context kvm_cpu_context_t;
static inline void kvm_init_host_cpu_context(kvm_cpu_context_t *cpu_ctxt,
int cpu)
{
/* The host's MPIDR is immutable, so let's set it up at boot time */
cpu_ctxt->cp15[c0_MPIDR] = cpu_logical_map(cpu);
}
struct kvm_vcpu_arch {
struct kvm_cpu_context ctxt;
@ -214,7 +225,35 @@ unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
unsigned long kvm_call_hyp(void *hypfn, ...);
unsigned long __kvm_call_hyp(void *hypfn, ...);
/*
* The has_vhe() part doesn't get emitted, but is used for type-checking.
*/
#define kvm_call_hyp(f, ...) \
do { \
if (has_vhe()) { \
f(__VA_ARGS__); \
} else { \
__kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__); \
} \
} while(0)
#define kvm_call_hyp_ret(f, ...) \
({ \
typeof(f(__VA_ARGS__)) ret; \
\
if (has_vhe()) { \
ret = f(__VA_ARGS__); \
} else { \
ret = __kvm_call_hyp(kvm_ksym_ref(f), \
##__VA_ARGS__); \
} \
\
ret; \
})
void force_vm_exit(const cpumask_t *mask);
int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
struct kvm_vcpu_events *events);
@ -265,7 +304,7 @@ static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
* compliant with the PCS!).
*/
kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
__kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
}
static inline void __cpu_init_stage2(void)

4
arch/arm/include/asm/kvm_hyp.h
View File

@ -40,6 +40,7 @@
#define TTBR1 __ACCESS_CP15_64(1, c2)
#define VTTBR __ACCESS_CP15_64(6, c2)
#define PAR __ACCESS_CP15_64(0, c7)
#define CNTP_CVAL __ACCESS_CP15_64(2, c14)
#define CNTV_CVAL __ACCESS_CP15_64(3, c14)
#define CNTVOFF __ACCESS_CP15_64(4, c14)
@ -85,6 +86,7 @@
#define TID_PRIV __ACCESS_CP15(c13, 0, c0, 4)
#define HTPIDR __ACCESS_CP15(c13, 4, c0, 2)
#define CNTKCTL __ACCESS_CP15(c14, 0, c1, 0)
#define CNTP_CTL __ACCESS_CP15(c14, 0, c2, 1)
#define CNTV_CTL __ACCESS_CP15(c14, 0, c3, 1)
#define CNTHCTL __ACCESS_CP15(c14, 4, c1, 0)
@ -94,6 +96,8 @@
#define read_sysreg_el0(r) read_sysreg(r##_el0)
#define write_sysreg_el0(v, r) write_sysreg(v, r##_el0)
#define cntp_ctl_el0 CNTP_CTL
#define cntp_cval_el0 CNTP_CVAL
#define cntv_ctl_el0 CNTV_CTL
#define cntv_cval_el0 CNTV_CVAL
#define cntvoff_el2 CNTVOFF

9
arch/arm/include/asm/kvm_mmu.h
View File

@ -421,9 +421,14 @@ static inline int hyp_map_aux_data(void)
static inline void kvm_set_ipa_limit(void) {}
static inline bool kvm_cpu_has_cnp(void)
static __always_inline u64 kvm_get_vttbr(struct kvm *kvm)
{
return false;
struct kvm_vmid *vmid = &kvm->arch.vmid;
u64 vmid_field, baddr;
baddr = kvm->arch.pgd_phys;
vmid_field = (u64)vmid->vmid << VTTBR_VMID_SHIFT;
return kvm_phys_to_vttbr(baddr) | vmid_field;
}
#endif /* !__ASSEMBLY__ */

5
arch/arm/kvm/Makefile
View File

@ -8,9 +8,8 @@ ifeq ($(plus_virt),+virt)
plus_virt_def := -DREQUIRES_VIRT=1
endif
ccflags-y += -Iarch/arm/kvm -Ivirt/kvm/arm/vgic
CFLAGS_arm.o := -I. $(plus_virt_def)
CFLAGS_mmu.o := -I.
ccflags-y += -I $(srctree)/$(src) -I $(srctree)/virt/kvm/arm/vgic
CFLAGS_arm.o := $(plus_virt_def)
AFLAGS_init.o := -Wa,-march=armv7-a$(plus_virt)
AFLAGS_interrupts.o := -Wa,-march=armv7-a$(plus_virt)

23
arch/arm/kvm/coproc.c
View File

@ -293,15 +293,16 @@ static bool access_cntp_tval(struct kvm_vcpu *vcpu,
const struct coproc_params *p,
const struct coproc_reg *r)
{
u64 now = kvm_phys_timer_read();
u64 val;
u32 val;
if (p->is_write) {
val = *vcpu_reg(vcpu, p->Rt1);
kvm_arm_timer_set_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL, val + now);
kvm_arm_timer_write_sysreg(vcpu,
TIMER_PTIMER, TIMER_REG_TVAL, val);
} else {
val = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL);
*vcpu_reg(vcpu, p->Rt1) = val - now;
val = kvm_arm_timer_read_sysreg(vcpu,
TIMER_PTIMER, TIMER_REG_TVAL);
*vcpu_reg(vcpu, p->Rt1) = val;
}
return true;
@ -315,9 +316,11 @@ static bool access_cntp_ctl(struct kvm_vcpu *vcpu,
if (p->is_write) {
val = *vcpu_reg(vcpu, p->Rt1);
kvm_arm_timer_set_reg(vcpu, KVM_REG_ARM_PTIMER_CTL, val);
kvm_arm_timer_write_sysreg(vcpu,
TIMER_PTIMER, TIMER_REG_CTL, val);
} else {
val = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_PTIMER_CTL);
val = kvm_arm_timer_read_sysreg(vcpu,
TIMER_PTIMER, TIMER_REG_CTL);
*vcpu_reg(vcpu, p->Rt1) = val;
}
@ -333,9 +336,11 @@ static bool access_cntp_cval(struct kvm_vcpu *vcpu,
if (p->is_write) {
val = (u64)*vcpu_reg(vcpu, p->Rt2) << 32;
val |= *vcpu_reg(vcpu, p->Rt1);
kvm_arm_timer_set_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL, val);
kvm_arm_timer_write_sysreg(vcpu,
TIMER_PTIMER, TIMER_REG_CVAL, val);
} else {
val = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL);
val = kvm_arm_timer_read_sysreg(vcpu,
TIMER_PTIMER, TIMER_REG_CVAL);
*vcpu_reg(vcpu, p->Rt1) = val;
*vcpu_reg(vcpu, p->Rt2) = val >> 32;
}

1
arch/arm/kvm/hyp/cp15-sr.c
View File

@ -27,7 +27,6 @@ static u64 *cp15_64(struct kvm_cpu_context *ctxt, int idx)
void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
{
ctxt->cp15[c0_MPIDR] = read_sysreg(VMPIDR);
ctxt->cp15[c0_CSSELR] = read_sysreg(CSSELR);
ctxt->cp15[c1_SCTLR] = read_sysreg(SCTLR);
ctxt->cp15[c1_CPACR] = read_sysreg(CPACR);

2
arch/arm/kvm/hyp/hyp-entry.S
View File

@ -176,7 +176,7 @@ THUMB( orr lr, lr, #PSR_T_BIT )
msr spsr_cxsf, lr
ldr lr, =panic
msr ELR_hyp, lr
ldr lr, =kvm_call_hyp
ldr lr, =__kvm_call_hyp
clrex
eret
ENDPROC(__hyp_do_panic)

2
arch/arm/kvm/hyp/switch.c
View File

@ -77,7 +77,7 @@ static void __hyp_text __deactivate_traps(struct kvm_vcpu *vcpu)
static void __hyp_text __activate_vm(struct kvm_vcpu *vcpu)
{
struct kvm *kvm = kern_hyp_va(vcpu->kvm);
write_sysreg(kvm->arch.vttbr, VTTBR);
write_sysreg(kvm_get_vttbr(kvm), VTTBR);
write_sysreg(vcpu->arch.midr, VPIDR);
}

4
arch/arm/kvm/hyp/tlb.c
View File

@ -41,7 +41,7 @@ void __hyp_text __kvm_tlb_flush_vmid(struct kvm *kvm)
/* Switch to requested VMID */
kvm = kern_hyp_va(kvm);
write_sysreg(kvm->arch.vttbr, VTTBR);
write_sysreg(kvm_get_vttbr(kvm), VTTBR);
isb();
write_sysreg(0, TLBIALLIS);
@ -61,7 +61,7 @@ void __hyp_text __kvm_tlb_flush_local_vmid(struct kvm_vcpu *vcpu)
struct kvm *kvm = kern_hyp_va(kern_hyp_va(vcpu)->kvm);
/* Switch to requested VMID */
write_sysreg(kvm->arch.vttbr, VTTBR);
write_sysreg(kvm_get_vttbr(kvm), VTTBR);
isb();
write_sysreg(0, TLBIALL);

4
arch/arm/kvm/interrupts.S
View File

@ -42,7 +42,7 @@
* r12: caller save
* rest: callee save
*/
ENTRY(kvm_call_hyp)
ENTRY(__kvm_call_hyp)
hvc #0
bx lr
ENDPROC(kvm_call_hyp)
ENDPROC(__kvm_call_hyp)

12
arch/arm64/include/asm/kvm_emulate.h
View File

@ -77,6 +77,10 @@ static inline void vcpu_reset_hcr(struct kvm_vcpu *vcpu)
*/
if (!vcpu_el1_is_32bit(vcpu))
vcpu->arch.hcr_el2 |= HCR_TID3;
if (cpus_have_const_cap(ARM64_MISMATCHED_CACHE_TYPE) ||
vcpu_el1_is_32bit(vcpu))
vcpu->arch.hcr_el2 |= HCR_TID2;
}
static inline unsigned long *vcpu_hcr(struct kvm_vcpu *vcpu)
@ -331,6 +335,14 @@ static inline int kvm_vcpu_sys_get_rt(struct kvm_vcpu *vcpu)
return ESR_ELx_SYS64_ISS_RT(esr);
}
static inline bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
{
if (kvm_vcpu_trap_is_iabt(vcpu))
return false;
return kvm_vcpu_dabt_iswrite(vcpu);
}
static inline unsigned long kvm_vcpu_get_mpidr_aff(struct kvm_vcpu *vcpu)
{
return vcpu_read_sys_reg(vcpu, MPIDR_EL1) & MPIDR_HWID_BITMASK;

48
arch/arm64/include/asm/kvm_host.h
View File

@ -30,6 +30,7 @@
#include <asm/kvm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmio.h>
#include <asm/smp_plat.h>
#include <asm/thread_info.h>
#define __KVM_HAVE_ARCH_INTC_INITIALIZED
@ -56,16 +57,19 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext);
void __extended_idmap_trampoline(phys_addr_t boot_pgd, phys_addr_t idmap_start);
struct kvm_arch {
struct kvm_vmid {
/* The VMID generation used for the virt. memory system */
u64 vmid_gen;
u32 vmid;
};
struct kvm_arch {
struct kvm_vmid vmid;
/* stage2 entry level table */
pgd_t *pgd;
phys_addr_t pgd_phys;
/* VTTBR value associated with above pgd and vmid */
u64 vttbr;
/* VTCR_EL2 value for this VM */
u64 vtcr;
@ -370,7 +374,36 @@ void kvm_arm_halt_guest(struct kvm *kvm);
void kvm_arm_resume_guest(struct kvm *kvm);
u64 __kvm_call_hyp(void *hypfn, ...);
#define kvm_call_hyp(f, ...) __kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__)
/*
* The couple of isb() below are there to guarantee the same behaviour
* on VHE as on !VHE, where the eret to EL1 acts as a context
* synchronization event.
*/
#define kvm_call_hyp(f, ...) \
do { \
if (has_vhe()) { \
f(__VA_ARGS__); \
isb(); \
} else { \
__kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__); \
} \
} while(0)
#define kvm_call_hyp_ret(f, ...) \
({ \
typeof(f(__VA_ARGS__)) ret; \
\
if (has_vhe()) { \
ret = f(__VA_ARGS__); \
isb(); \
} else { \
ret = __kvm_call_hyp(kvm_ksym_ref(f), \
##__VA_ARGS__); \
} \
\
ret; \
})
void force_vm_exit(const cpumask_t *mask);
void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
@ -389,6 +422,13 @@ struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
DECLARE_PER_CPU(kvm_cpu_context_t, kvm_host_cpu_state);
static inline void kvm_init_host_cpu_context(kvm_cpu_context_t *cpu_ctxt,
int cpu)
{
/* The host's MPIDR is immutable, so let's set it up at boot time */
cpu_ctxt->sys_regs[MPIDR_EL1] = cpu_logical_map(cpu);
}
void __kvm_enable_ssbs(void);
static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,

3
arch/arm64/include/asm/kvm_hyp.h
View File

@ -21,6 +21,7 @@
#include <linux/compiler.h>
#include <linux/kvm_host.h>
#include <asm/alternative.h>
#include <asm/kvm_mmu.h>
#include <asm/sysreg.h>
#define __hyp_text __section(.hyp.text) notrace
@ -163,7 +164,7 @@ void __noreturn __hyp_do_panic(unsigned long, ...);
static __always_inline void __hyp_text __load_guest_stage2(struct kvm *kvm)
{
write_sysreg(kvm->arch.vtcr, vtcr_el2);
write_sysreg(kvm->arch.vttbr, vttbr_el2);
write_sysreg(kvm_get_vttbr(kvm), vttbr_el2);
/*
* ARM erratum 1165522 requires the actual execution of the above

13
arch/arm64/include/asm/kvm_mmu.h
View File

@ -138,7 +138,8 @@ static inline unsigned long __kern_hyp_va(unsigned long v)
})
/*
* We currently only support a 40bit IPA.
* We currently support using a VM-specified IPA size. For backward
* compatibility, the default IPA size is fixed to 40bits.
*/
#define KVM_PHYS_SHIFT (40)
@ -591,9 +592,15 @@ static inline u64 kvm_vttbr_baddr_mask(struct kvm *kvm)
return vttbr_baddr_mask(kvm_phys_shift(kvm), kvm_stage2_levels(kvm));
}
static inline bool kvm_cpu_has_cnp(void)
static __always_inline u64 kvm_get_vttbr(struct kvm *kvm)
{
return system_supports_cnp();
struct kvm_vmid *vmid = &kvm->arch.vmid;
u64 vmid_field, baddr;
u64 cnp = system_supports_cnp() ? VTTBR_CNP_BIT : 0;
baddr = kvm->arch.pgd_phys;
vmid_field = (u64)vmid->vmid << VTTBR_VMID_SHIFT;
return kvm_phys_to_vttbr(baddr) | vmid_field | cnp;
}
#endif /* __ASSEMBLY__ */

7
arch/arm64/include/asm/sysreg.h
View File

@ -361,6 +361,7 @@
#define SYS_CNTKCTL_EL1 sys_reg(3, 0, 14, 1, 0)
#define SYS_CCSIDR_EL1 sys_reg(3, 1, 0, 0, 0)
#define SYS_CLIDR_EL1 sys_reg(3, 1, 0, 0, 1)
#define SYS_AIDR_EL1 sys_reg(3, 1, 0, 0, 7)
@ -392,6 +393,10 @@
#define SYS_CNTP_CTL_EL0 sys_reg(3, 3, 14, 2, 1)
#define SYS_CNTP_CVAL_EL0 sys_reg(3, 3, 14, 2, 2)
#define SYS_AARCH32_CNTP_TVAL sys_reg(0, 0, 14, 2, 0)
#define SYS_AARCH32_CNTP_CTL sys_reg(0, 0, 14, 2, 1)
#define SYS_AARCH32_CNTP_CVAL sys_reg(0, 2, 0, 14, 0)
#define __PMEV_op2(n) ((n) & 0x7)
#define __CNTR_CRm(n) (0x8 | (((n) >> 3) & 0x3))
#define SYS_PMEVCNTRn_EL0(n) sys_reg(3, 3, 14, __CNTR_CRm(n), __PMEV_op2(n))
@ -426,7 +431,7 @@
#define SYS_ICH_VTR_EL2 sys_reg(3, 4, 12, 11, 1)
#define SYS_ICH_MISR_EL2 sys_reg(3, 4, 12, 11, 2)
#define SYS_ICH_EISR_EL2 sys_reg(3, 4, 12, 11, 3)
#define SYS_ICH_ELSR_EL2 sys_reg(3, 4, 12, 11, 5)
#define SYS_ICH_ELRSR_EL2 sys_reg(3, 4, 12, 11, 5)
#define SYS_ICH_VMCR_EL2 sys_reg(3, 4, 12, 11, 7)
#define __SYS__LR0_EL2(x) sys_reg(3, 4, 12, 12, x)

4
arch/arm64/kvm/Makefile
View File

@ -3,9 +3,7 @@
# Makefile for Kernel-based Virtual Machine module
#
ccflags-y += -Iarch/arm64/kvm -Ivirt/kvm/arm/vgic
CFLAGS_arm.o := -I.
CFLAGS_mmu.o := -I.
ccflags-y += -I $(srctree)/$(src) -I $(srctree)/virt/kvm/arm/vgic
KVM=../../../virt/kvm

2
arch/arm64/kvm/debug.c
View File

@ -76,7 +76,7 @@ static void restore_guest_debug_regs(struct kvm_vcpu *vcpu)
void kvm_arm_init_debug(void)
{
__this_cpu_write(mdcr_el2, kvm_call_hyp(__kvm_get_mdcr_el2));
__this_cpu_write(mdcr_el2, kvm_call_hyp_ret(__kvm_get_mdcr_el2));
}
/**

3
arch/arm64/kvm/hyp.S
View File

@ -40,9 +40,6 @@
* arch/arm64/kernel/hyp_stub.S.
*/
ENTRY(__kvm_call_hyp)
alternative_if_not ARM64_HAS_VIRT_HOST_EXTN
hvc #0
ret
alternative_else_nop_endif
b __vhe_hyp_call
ENDPROC(__kvm_call_hyp)

12
arch/arm64/kvm/hyp/hyp-entry.S
View File

@ -43,18 +43,6 @@
ldr lr, [sp], #16
.endm
ENTRY(__vhe_hyp_call)
do_el2_call
/*
* We used to rely on having an exception return to get
* an implicit isb. In the E2H case, we don't have it anymore.
* rather than changing all the leaf functions, just do it here
* before returning to the rest of the kernel.
*/
isb
ret
ENDPROC(__vhe_hyp_call)
el1_sync: // Guest trapped into EL2
mrs x0, esr_el2

1
arch/arm64/kvm/hyp/sysreg-sr.c
View File

@ -52,7 +52,6 @@ static void __hyp_text __sysreg_save_user_state(struct kvm_cpu_context *ctxt)
static void __hyp_text __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
{
ctxt->sys_regs[MPIDR_EL1] = read_sysreg(vmpidr_el2);
ctxt->sys_regs[CSSELR_EL1] = read_sysreg(csselr_el1);
ctxt->sys_regs[SCTLR_EL1] = read_sysreg_el1(sctlr);
ctxt->sys_regs[ACTLR_EL1] = read_sysreg(actlr_el1);

168
arch/arm64/kvm/sys_regs.c
View File

@ -965,6 +965,10 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
return true;
}
#define reg_to_encoding(x) \
sys_reg((u32)(x)->Op0, (u32)(x)->Op1, \
(u32)(x)->CRn, (u32)(x)->CRm, (u32)(x)->Op2);
/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
#define DBG_BCR_BVR_WCR_WVR_EL1(n) \
{ SYS_DESC(SYS_DBGBVRn_EL1(n)), \
@ -986,44 +990,38 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
{ SYS_DESC(SYS_PMEVTYPERn_EL0(n)), \
access_pmu_evtyper, reset_unknown, (PMEVTYPER0_EL0 + n), }
static bool access_cntp_tval(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
static bool access_arch_timer(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
u64 now = kvm_phys_timer_read();
u64 cval;
enum kvm_arch_timers tmr;
enum kvm_arch_timer_regs treg;
u64 reg = reg_to_encoding(r);
if (p->is_write) {
kvm_arm_timer_set_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL,
p->regval + now);
} else {
cval = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL);
p->regval = cval - now;
switch (reg) {
case SYS_CNTP_TVAL_EL0:
case SYS_AARCH32_CNTP_TVAL:
tmr = TIMER_PTIMER;
treg = TIMER_REG_TVAL;
break;
case SYS_CNTP_CTL_EL0:
case SYS_AARCH32_CNTP_CTL:
tmr = TIMER_PTIMER;
treg = TIMER_REG_CTL;
break;
case SYS_CNTP_CVAL_EL0:
case SYS_AARCH32_CNTP_CVAL:
tmr = TIMER_PTIMER;
treg = TIMER_REG_CVAL;
break;
default:
BUG();
}
return true;
}
static bool access_cntp_ctl(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
if (p->is_write)
kvm_arm_timer_set_reg(vcpu, KVM_REG_ARM_PTIMER_CTL, p->regval);
kvm_arm_timer_write_sysreg(vcpu, tmr, treg, p->regval);
else
p->regval = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_PTIMER_CTL);
return true;
}
static bool access_cntp_cval(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
if (p->is_write)
kvm_arm_timer_set_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL, p->regval);
else
p->regval = kvm_arm_timer_get_reg(vcpu, KVM_REG_ARM_PTIMER_CVAL);
p->regval = kvm_arm_timer_read_sysreg(vcpu, tmr, treg);
return true;
}
@ -1148,6 +1146,64 @@ static int set_raz_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
return __set_id_reg(rd, uaddr, true);
}
static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
if (p->is_write)
return write_to_read_only(vcpu, p, r);
p->regval = read_sanitised_ftr_reg(SYS_CTR_EL0);
return true;
}
static bool access_clidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
if (p->is_write)
return write_to_read_only(vcpu, p, r);
p->regval = read_sysreg(clidr_el1);
return true;
}
static bool access_csselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
if (p->is_write)
vcpu_write_sys_reg(vcpu, p->regval, r->reg);
else
p->regval = vcpu_read_sys_reg(vcpu, r->reg);
return true;
}
static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
const struct sys_reg_desc *r)
{
u32 csselr;
if (p->is_write)
return write_to_read_only(vcpu, p, r);
csselr = vcpu_read_sys_reg(vcpu, CSSELR_EL1);
p->regval = get_ccsidr(csselr);
/*
* Guests should not be doing cache operations by set/way at all, and
* for this reason, we trap them and attempt to infer the intent, so
* that we can flush the entire guest's address space at the appropriate
* time.
* To prevent this trapping from causing performance problems, let's
* expose the geometry of all data and unified caches (which are
* guaranteed to be PIPT and thus non-aliasing) as 1 set and 1 way.
* [If guests should attempt to infer aliasing properties from the
* geometry (which is not permitted by the architecture), they would
* only do so for virtually indexed caches.]
*/
if (!(csselr & 1)) // data or unified cache
p->regval &= ~GENMASK(27, 3);
return true;
}
/* sys_reg_desc initialiser for known cpufeature ID registers */
#define ID_SANITISED(name) { \
SYS_DESC(SYS_##name), \
@ -1365,7 +1421,10 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0},
{ SYS_DESC(SYS_CSSELR_EL1), NULL, reset_unknown, CSSELR_EL1 },
{ SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr },
{ SYS_DESC(SYS_CLIDR_EL1), access_clidr },
{ SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 },
{ SYS_DESC(SYS_CTR_EL0), access_ctr },
{ SYS_DESC(SYS_PMCR_EL0), access_pmcr, reset_pmcr, },
{ SYS_DESC(SYS_PMCNTENSET_EL0), access_pmcnten, reset_unknown, PMCNTENSET_EL0 },
@ -1388,9 +1447,9 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
{ SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
{ SYS_DESC(SYS_CNTP_TVAL_EL0), access_cntp_tval },
{ SYS_DESC(SYS_CNTP_CTL_EL0), access_cntp_ctl },
{ SYS_DESC(SYS_CNTP_CVAL_EL0), access_cntp_cval },
{ SYS_DESC(SYS_CNTP_TVAL_EL0), access_arch_timer },
{ SYS_DESC(SYS_CNTP_CTL_EL0), access_arch_timer },
{ SYS_DESC(SYS_CNTP_CVAL_EL0), access_arch_timer },
/* PMEVCNTRn_EL0 */
PMU_PMEVCNTR_EL0(0),
@ -1464,7 +1523,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 },
{ SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 },
{ SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x70 },
{ SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 },
};
static bool trap_dbgidr(struct kvm_vcpu *vcpu,
@ -1665,6 +1724,7 @@ static const struct sys_reg_desc cp14_64_regs[] = {
* register).
*/
static const struct sys_reg_desc cp15_regs[] = {
{ Op1( 0), CRn( 0), CRm( 0), Op2( 1), access_ctr },
{ Op1( 0), CRn( 1), CRm( 0), Op2( 0), access_vm_reg, NULL, c1_SCTLR },
{ Op1( 0), CRn( 2), CRm( 0), Op2( 0), access_vm_reg, NULL, c2_TTBR0 },
{ Op1( 0), CRn( 2), CRm( 0), Op2( 1), access_vm_reg, NULL, c2_TTBR1 },
@ -1711,10 +1771,9 @@ static const struct sys_reg_desc cp15_regs[] = {
{ Op1( 0), CRn(13), CRm( 0), Op2( 1), access_vm_reg, NULL, c13_CID },
/* CNTP_TVAL */
{ Op1( 0), CRn(14), CRm( 2), Op2( 0), access_cntp_tval },
/* CNTP_CTL */
{ Op1( 0), CRn(14), CRm( 2), Op2( 1), access_cntp_ctl },
/* Arch Tmers */
{ SYS_DESC(SYS_AARCH32_CNTP_TVAL), access_arch_timer },
{ SYS_DESC(SYS_AARCH32_CNTP_CTL), access_arch_timer },
/* PMEVCNTRn */
PMU_PMEVCNTR(0),
@ -1782,6 +1841,10 @@ static const struct sys_reg_desc cp15_regs[] = {
PMU_PMEVTYPER(30),
/* PMCCFILTR */
{ Op1(0), CRn(14), CRm(15), Op2(7), access_pmu_evtyper },
{ Op1(1), CRn( 0), CRm( 0), Op2(0), access_ccsidr },
{ Op1(1), CRn( 0), CRm( 0), Op2(1), access_clidr },
{ Op1(2), CRn( 0), CRm( 0), Op2(0), access_csselr, NULL, c0_CSSELR },
};
static const struct sys_reg_desc cp15_64_regs[] = {
@ -1791,7 +1854,7 @@ static const struct sys_reg_desc cp15_64_regs[] = {
{ Op1( 1), CRn( 0), CRm( 2), Op2( 0), access_vm_reg, NULL, c2_TTBR1 },
{ Op1( 1), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_ASGI1R */
{ Op1( 2), CRn( 0), CRm(12), Op2( 0), access_gic_sgi }, /* ICC_SGI0R */
{ Op1( 2), CRn( 0), CRm(14), Op2( 0), access_cntp_cval },
{ SYS_DESC(SYS_AARCH32_CNTP_CVAL), access_arch_timer },
};
/* Target specific emulation tables */
@ -1820,30 +1883,19 @@ static const struct sys_reg_desc *get_target_table(unsigned target,
}
}
#define reg_to_match_value(x) \
({ \
unsigned long val; \
val = (x)->Op0 << 14; \
val |= (x)->Op1 << 11; \
val |= (x)->CRn << 7; \
val |= (x)->CRm << 3; \
val |= (x)->Op2; \
val; \
})
static int match_sys_reg(const void *key, const void *elt)
{
const unsigned long pval = (unsigned long)key;
const struct sys_reg_desc *r = elt;
return pval - reg_to_match_value(r);
return pval - reg_to_encoding(r);
}
static const struct sys_reg_desc *find_reg(const struct sys_reg_params *params,
const struct sys_reg_desc table[],
unsigned int num)
{
unsigned long pval = reg_to_match_value(params);
unsigned long pval = reg_to_encoding(params);
return bsearch((void *)pval, table, num, sizeof(table[0]), match_sys_reg);
}
@ -2206,11 +2258,15 @@ static const struct sys_reg_desc *index_to_sys_reg_desc(struct kvm_vcpu *vcpu,
}
FUNCTION_INVARIANT(midr_el1)
FUNCTION_INVARIANT(ctr_el0)
FUNCTION_INVARIANT(revidr_el1)
FUNCTION_INVARIANT(clidr_el1)
FUNCTION_INVARIANT(aidr_el1)
static void get_ctr_el0(struct kvm_vcpu *v, const struct sys_reg_desc *r)
{
((struct sys_reg_desc *)r)->val = read_sanitised_ftr_reg(SYS_CTR_EL0);
}
/* ->val is filled in by kvm_sys_reg_table_init() */
static struct sys_reg_desc invariant_sys_regs[] = {
{ SYS_DESC(SYS_MIDR_EL1), NULL, get_midr_el1 },

11
drivers/clocksource/arm_arch_timer.c
View File

@ -1206,6 +1206,13 @@ static enum arch_timer_ppi_nr __init arch_timer_select_ppi(void)
return ARCH_TIMER_PHYS_SECURE_PPI;
}
static void __init arch_timer_populate_kvm_info(void)
{
arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
if (is_kernel_in_hyp_mode())
arch_timer_kvm_info.physical_irq = arch_timer_ppi[ARCH_TIMER_PHYS_NONSECURE_PPI];
}
static int __init arch_timer_of_init(struct device_node *np)
{
int i, ret;
@ -1220,7 +1227,7 @@ static int __init arch_timer_of_init(struct device_node *np)
for (i = ARCH_TIMER_PHYS_SECURE_PPI; i < ARCH_TIMER_MAX_TIMER_PPI; i++)
arch_timer_ppi[i] = irq_of_parse_and_map(np, i);
arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
arch_timer_populate_kvm_info();
rate = arch_timer_get_cntfrq();
arch_timer_of_configure_rate(rate, np);
@ -1550,7 +1557,7 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
arch_timer_ppi[ARCH_TIMER_HYP_PPI] =
acpi_gtdt_map_ppi(ARCH_TIMER_HYP_PPI);
arch_timer_kvm_info.virtual_irq = arch_timer_ppi[ARCH_TIMER_VIRT_PPI];
arch_timer_populate_kvm_info();
/*
* When probing via ACPI, we have no mechanism to override the sysreg

1
include/clocksource/arm_arch_timer.h
View File

@ -74,6 +74,7 @@ enum arch_timer_spi_nr {
struct arch_timer_kvm_info {
struct timecounter timecounter;
int virtual_irq;
int physical_irq;
};
struct arch_timer_mem_frame {

72
include/kvm/arm_arch_timer.h
View File

@ -22,7 +22,22 @@
#include <linux/clocksource.h>
#include <linux/hrtimer.h>
enum kvm_arch_timers {
TIMER_PTIMER,
TIMER_VTIMER,
NR_KVM_TIMERS
};
enum kvm_arch_timer_regs {
TIMER_REG_CNT,
TIMER_REG_CVAL,
TIMER_REG_TVAL,
TIMER_REG_CTL,
};
struct arch_timer_context {
struct kvm_vcpu *vcpu;
/* Registers: control register, timer value */
u32 cnt_ctl;
u64 cnt_cval;
@ -30,30 +45,36 @@ struct arch_timer_context {
/* Timer IRQ */
struct kvm_irq_level irq;
/*
* We have multiple paths which can save/restore the timer state
* onto the hardware, so we need some way of keeping track of
* where the latest state is.
*
* loaded == true: State is loaded on the hardware registers.
* loaded == false: State is stored in memory.
*/
bool loaded;
/* Virtual offset */
u64 cntvoff;
u64 cntvoff;
/* Emulated Timer (may be unused) */
struct hrtimer hrtimer;
/*
* We have multiple paths which can save/restore the timer state onto
* the hardware, so we need some way of keeping track of where the
* latest state is.
*/
bool loaded;
/* Duplicated state from arch_timer.c for convenience */
u32 host_timer_irq;
u32 host_timer_irq_flags;
};
struct timer_map {
struct arch_timer_context *direct_vtimer;
struct arch_timer_context *direct_ptimer;
struct arch_timer_context *emul_ptimer;
};
struct arch_timer_cpu {
struct arch_timer_context vtimer;
struct arch_timer_context ptimer;
struct arch_timer_context timers[NR_KVM_TIMERS];
/* Background timer used when the guest is not running */
struct hrtimer bg_timer;
/* Physical timer emulation */
struct hrtimer phys_timer;
/* Is the timer enabled */
bool enabled;
};
@ -76,9 +97,6 @@ int kvm_arm_timer_has_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
bool kvm_timer_is_pending(struct kvm_vcpu *vcpu);
void kvm_timer_schedule(struct kvm_vcpu *vcpu);
void kvm_timer_unschedule(struct kvm_vcpu *vcpu);
u64 kvm_phys_timer_read(void);
void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu);
@ -88,7 +106,19 @@ void kvm_timer_init_vhe(void);
bool kvm_arch_timer_get_input_level(int vintid);
#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.vtimer)
#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.ptimer)
#define vcpu_timer(v) (&(v)->arch.timer_cpu)
#define vcpu_get_timer(v,t) (&vcpu_timer(v)->timers[(t)])
#define vcpu_vtimer(v) (&(v)->arch.timer_cpu.timers[TIMER_VTIMER])
#define vcpu_ptimer(v) (&(v)->arch.timer_cpu.timers[TIMER_PTIMER])
#define arch_timer_ctx_index(ctx) ((ctx) - vcpu_timer((ctx)->vcpu)->timers)
u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
enum kvm_arch_timers tmr,
enum kvm_arch_timer_regs treg);
void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
enum kvm_arch_timers tmr,
enum kvm_arch_timer_regs treg,
u64 val);
#endif

616
virt/kvm/arm/arch_timer.c
View File

@ -25,6 +25,7 @@
#include <clocksource/arm_arch_timer.h>
#include <asm/arch_timer.h>
#include <asm/kvm_emulate.h>
#include <asm/kvm_hyp.h>
#include <kvm/arm_vgic.h>
@ -34,7 +35,9 @@
static struct timecounter *timecounter;
static unsigned int host_vtimer_irq;
static unsigned int host_ptimer_irq;
static u32 host_vtimer_irq_flags;
static u32 host_ptimer_irq_flags;
static DEFINE_STATIC_KEY_FALSE(has_gic_active_state);
@ -52,12 +55,34 @@ static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx);
static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
struct arch_timer_context *timer_ctx);
static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx);
static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg,
u64 val);
static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg);
u64 kvm_phys_timer_read(void)
{
return timecounter->cc->read(timecounter->cc);
}
static void get_timer_map(struct kvm_vcpu *vcpu, struct timer_map *map)
{
if (has_vhe()) {
map->direct_vtimer = vcpu_vtimer(vcpu);
map->direct_ptimer = vcpu_ptimer(vcpu);
map->emul_ptimer = NULL;
} else {
map->direct_vtimer = vcpu_vtimer(vcpu);
map->direct_ptimer = NULL;
map->emul_ptimer = vcpu_ptimer(vcpu);
}
trace_kvm_get_timer_map(vcpu->vcpu_id, map);
}
static inline bool userspace_irqchip(struct kvm *kvm)
{
return static_branch_unlikely(&userspace_irqchip_in_use) &&
@ -78,20 +103,27 @@ static void soft_timer_cancel(struct hrtimer *hrt)
static irqreturn_t kvm_arch_timer_handler(int irq, void *dev_id)
{
struct kvm_vcpu *vcpu = *(struct kvm_vcpu **)dev_id;
struct arch_timer_context *vtimer;
struct arch_timer_context *ctx;
struct timer_map map;
/*
* We may see a timer interrupt after vcpu_put() has been called which
* sets the CPU's vcpu pointer to NULL, because even though the timer
* has been disabled in vtimer_save_state(), the hardware interrupt
* has been disabled in timer_save_state(), the hardware interrupt
* signal may not have been retired from the interrupt controller yet.
*/
if (!vcpu)
return IRQ_HANDLED;
vtimer = vcpu_vtimer(vcpu);
if (kvm_timer_should_fire(vtimer))
kvm_timer_update_irq(vcpu, true, vtimer);
get_timer_map(vcpu, &map);
if (irq == host_vtimer_irq)
ctx = map.direct_vtimer;
else
ctx = map.direct_ptimer;
if (kvm_timer_should_fire(ctx))
kvm_timer_update_irq(vcpu, true, ctx);
if (userspace_irqchip(vcpu->kvm) &&
!static_branch_unlikely(&has_gic_active_state))
@ -122,7 +154,9 @@ static u64 kvm_timer_compute_delta(struct arch_timer_context *timer_ctx)
static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
{
return !(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
WARN_ON(timer_ctx && timer_ctx->loaded);
return timer_ctx &&
!(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_ENABLE);
}
@ -132,21 +166,22 @@ static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
*/
static u64 kvm_timer_earliest_exp(struct kvm_vcpu *vcpu)
{
u64 min_virt = ULLONG_MAX, min_phys = ULLONG_MAX;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
u64 min_delta = ULLONG_MAX;
int i;
if (kvm_timer_irq_can_fire(vtimer))
min_virt = kvm_timer_compute_delta(vtimer);
for (i = 0; i < NR_KVM_TIMERS; i++) {
struct arch_timer_context *ctx = &vcpu->arch.timer_cpu.timers[i];
if (kvm_timer_irq_can_fire(ptimer))
min_phys = kvm_timer_compute_delta(ptimer);
WARN(ctx->loaded, "timer %d loaded\n", i);
if (kvm_timer_irq_can_fire(ctx))
min_delta = min(min_delta, kvm_timer_compute_delta(ctx));
}
/* If none of timers can fire, then return 0 */
if ((min_virt == ULLONG_MAX) && (min_phys == ULLONG_MAX))
if (min_delta == ULLONG_MAX)
return 0;
return min(min_virt, min_phys);
return min_delta;
}
static enum hrtimer_restart kvm_bg_timer_expire(struct hrtimer *hrt)
@ -173,41 +208,58 @@ static enum hrtimer_restart kvm_bg_timer_expire(struct hrtimer *hrt)
return HRTIMER_NORESTART;
}
static enum hrtimer_restart kvm_phys_timer_expire(struct hrtimer *hrt)
static enum hrtimer_restart kvm_hrtimer_expire(struct hrtimer *hrt)
{
struct arch_timer_context *ptimer;
struct arch_timer_cpu *timer;
struct arch_timer_context *ctx;
struct kvm_vcpu *vcpu;
u64 ns;
timer = container_of(hrt, struct arch_timer_cpu, phys_timer);
vcpu = container_of(timer, struct kvm_vcpu, arch.timer_cpu);
ptimer = vcpu_ptimer(vcpu);
ctx = container_of(hrt, struct arch_timer_context, hrtimer);
vcpu = ctx->vcpu;
trace_kvm_timer_hrtimer_expire(ctx);
/*
* Check that the timer has really expired from the guest's
* PoV (NTP on the host may have forced it to expire
* early). If not ready, schedule for a later time.
*/
ns = kvm_timer_compute_delta(ptimer);
ns = kvm_timer_compute_delta(ctx);
if (unlikely(ns)) {
hrtimer_forward_now(hrt, ns_to_ktime(ns));
return HRTIMER_RESTART;
}
kvm_timer_update_irq(vcpu, true, ptimer);
kvm_timer_update_irq(vcpu, true, ctx);
return HRTIMER_NORESTART;
}
static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx)
{
enum kvm_arch_timers index;
u64 cval, now;
if (timer_ctx->loaded) {
u32 cnt_ctl;
if (!timer_ctx)
return false;
index = arch_timer_ctx_index(timer_ctx);
if (timer_ctx->loaded) {
u32 cnt_ctl = 0;
switch (index) {
case TIMER_VTIMER:
cnt_ctl = read_sysreg_el0(cntv_ctl);
break;
case TIMER_PTIMER:
cnt_ctl = read_sysreg_el0(cntp_ctl);
break;
case NR_KVM_TIMERS:
/* GCC is braindead */
cnt_ctl = 0;
break;
}
/* Only the virtual timer can be loaded so far */
cnt_ctl = read_sysreg_el0(cntv_ctl);
return (cnt_ctl & ARCH_TIMER_CTRL_ENABLE) &&
(cnt_ctl & ARCH_TIMER_CTRL_IT_STAT) &&
!(cnt_ctl & ARCH_TIMER_CTRL_IT_MASK);
@ -224,13 +276,13 @@ static bool kvm_timer_should_fire(struct arch_timer_context *timer_ctx)
bool kvm_timer_is_pending(struct kvm_vcpu *vcpu)
{
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
struct timer_map map;
if (kvm_timer_should_fire(vtimer))
return true;
get_timer_map(vcpu, &map);
return kvm_timer_should_fire(ptimer);
return kvm_timer_should_fire(map.direct_vtimer) ||
kvm_timer_should_fire(map.direct_ptimer) ||
kvm_timer_should_fire(map.emul_ptimer);
}
/*
@ -269,77 +321,70 @@ static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,
}
}
/* Schedule the background timer for the emulated timer. */
static void phys_timer_emulate(struct kvm_vcpu *vcpu)
static void timer_emulate(struct arch_timer_context *ctx)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
bool should_fire = kvm_timer_should_fire(ctx);
trace_kvm_timer_emulate(ctx, should_fire);
if (should_fire) {
kvm_timer_update_irq(ctx->vcpu, true, ctx);
return;
}
/*
* If the timer can fire now, we don't need to have a soft timer
* scheduled for the future. If the timer cannot fire at all,
* then we also don't need a soft timer.
*/
if (kvm_timer_should_fire(ptimer) || !kvm_timer_irq_can_fire(ptimer)) {
soft_timer_cancel(&timer->phys_timer);
if (!kvm_timer_irq_can_fire(ctx)) {
soft_timer_cancel(&ctx->hrtimer);
return;
}
soft_timer_start(&timer->phys_timer, kvm_timer_compute_delta(ptimer));
soft_timer_start(&ctx->hrtimer, kvm_timer_compute_delta(ctx));
}
/*
* Check if there was a change in the timer state, so that we should either
* raise or lower the line level to the GIC or schedule a background timer to
* emulate the physical timer.
*/
static void kvm_timer_update_state(struct kvm_vcpu *vcpu)
static void timer_save_state(struct arch_timer_context *ctx)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
bool level;
if (unlikely(!timer->enabled))
return;
/*
* The vtimer virtual interrupt is a 'mapped' interrupt, meaning part
* of its lifecycle is offloaded to the hardware, and we therefore may
* not have lowered the irq.level value before having to signal a new
* interrupt, but have to signal an interrupt every time the level is
* asserted.
*/
level = kvm_timer_should_fire(vtimer);
kvm_timer_update_irq(vcpu, level, vtimer);
phys_timer_emulate(vcpu);
if (kvm_timer_should_fire(ptimer) != ptimer->irq.level)
kvm_timer_update_irq(vcpu, !ptimer->irq.level, ptimer);
}
static void vtimer_save_state(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_cpu *timer = vcpu_timer(ctx->vcpu);
enum kvm_arch_timers index = arch_timer_ctx_index(ctx);
unsigned long flags;
if (!timer->enabled)
return;
local_irq_save(flags);
if (!vtimer->loaded)
if (!ctx->loaded)
goto out;
if (timer->enabled) {
vtimer->cnt_ctl = read_sysreg_el0(cntv_ctl);
vtimer->cnt_cval = read_sysreg_el0(cntv_cval);
switch (index) {
case TIMER_VTIMER:
ctx->cnt_ctl = read_sysreg_el0(cntv_ctl);
ctx->cnt_cval = read_sysreg_el0(cntv_cval);
/* Disable the timer */
write_sysreg_el0(0, cntv_ctl);
isb();
break;
case TIMER_PTIMER:
ctx->cnt_ctl = read_sysreg_el0(cntp_ctl);
ctx->cnt_cval = read_sysreg_el0(cntp_cval);
/* Disable the timer */
write_sysreg_el0(0, cntp_ctl);
isb();
break;
case NR_KVM_TIMERS:
BUG();
}
/* Disable the virtual timer */
write_sysreg_el0(0, cntv_ctl);
isb();
trace_kvm_timer_save_state(ctx);
vtimer->loaded = false;
ctx->loaded = false;
out:
local_irq_restore(flags);
}
@ -349,67 +394,72 @@ static void vtimer_save_state(struct kvm_vcpu *vcpu)
* thread is removed from its waitqueue and made runnable when there's a timer
* interrupt to handle.
*/
void kvm_timer_schedule(struct kvm_vcpu *vcpu)
static void kvm_timer_blocking(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
struct timer_map map;
vtimer_save_state(vcpu);
get_timer_map(vcpu, &map);
/*
* No need to schedule a background timer if any guest timer has
* already expired, because kvm_vcpu_block will return before putting
* the thread to sleep.
*/
if (kvm_timer_should_fire(vtimer) || kvm_timer_should_fire(ptimer))
return;
/*
* If both timers are not capable of raising interrupts (disabled or
* If no timers are capable of raising interrupts (disabled or
* masked), then there's no more work for us to do.
*/
if (!kvm_timer_irq_can_fire(vtimer) && !kvm_timer_irq_can_fire(ptimer))
if (!kvm_timer_irq_can_fire(map.direct_vtimer) &&
!kvm_timer_irq_can_fire(map.direct_ptimer) &&
!kvm_timer_irq_can_fire(map.emul_ptimer))
return;
/*
* The guest timers have not yet expired, schedule a background timer.
* At least one guest time will expire. Schedule a background timer.
* Set the earliest expiration time among the guest timers.
*/
soft_timer_start(&timer->bg_timer, kvm_timer_earliest_exp(vcpu));
}
static void vtimer_restore_state(struct kvm_vcpu *vcpu)
static void kvm_timer_unblocking(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
soft_timer_cancel(&timer->bg_timer);
}
static void timer_restore_state(struct arch_timer_context *ctx)
{
struct arch_timer_cpu *timer = vcpu_timer(ctx->vcpu);
enum kvm_arch_timers index = arch_timer_ctx_index(ctx);
unsigned long flags;
if (!timer->enabled)
return;
local_irq_save(flags);
if (vtimer->loaded)
if (ctx->loaded)
goto out;
if (timer->enabled) {
write_sysreg_el0(vtimer->cnt_cval, cntv_cval);
switch (index) {
case TIMER_VTIMER:
write_sysreg_el0(ctx->cnt_cval, cntv_cval);
isb();
write_sysreg_el0(vtimer->cnt_ctl, cntv_ctl);
write_sysreg_el0(ctx->cnt_ctl, cntv_ctl);
break;
case TIMER_PTIMER:
write_sysreg_el0(ctx->cnt_cval, cntp_cval);
isb();
write_sysreg_el0(ctx->cnt_ctl, cntp_ctl);
break;
case NR_KVM_TIMERS:
BUG();
}
vtimer->loaded = true;
trace_kvm_timer_restore_state(ctx);
ctx->loaded = true;
out:
local_irq_restore(flags);
}
void kvm_timer_unschedule(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
vtimer_restore_state(vcpu);
soft_timer_cancel(&timer->bg_timer);
}
static void set_cntvoff(u64 cntvoff)
{
u32 low = lower_32_bits(cntvoff);
@ -425,23 +475,32 @@ static void set_cntvoff(u64 cntvoff)
kvm_call_hyp(__kvm_timer_set_cntvoff, low, high);
}
static inline void set_vtimer_irq_phys_active(struct kvm_vcpu *vcpu, bool active)
static inline void set_timer_irq_phys_active(struct arch_timer_context *ctx, bool active)
{
int r;
r = irq_set_irqchip_state(host_vtimer_irq, IRQCHIP_STATE_ACTIVE, active);
r = irq_set_irqchip_state(ctx->host_timer_irq, IRQCHIP_STATE_ACTIVE, active);
WARN_ON(r);
}
static void kvm_timer_vcpu_load_gic(struct kvm_vcpu *vcpu)
static void kvm_timer_vcpu_load_gic(struct arch_timer_context *ctx)
{
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
bool phys_active;
struct kvm_vcpu *vcpu = ctx->vcpu;
bool phys_active = false;
/*
* Update the timer output so that it is likely to match the
* state we're about to restore. If the timer expires between
* this point and the register restoration, we'll take the
* interrupt anyway.
*/
kvm_timer_update_irq(ctx->vcpu, kvm_timer_should_fire(ctx), ctx);
if (irqchip_in_kernel(vcpu->kvm))
phys_active = kvm_vgic_map_is_active(vcpu, vtimer->irq.irq);
else
phys_active = vtimer->irq.level;
set_vtimer_irq_phys_active(vcpu, phys_active);
phys_active = kvm_vgic_map_is_active(vcpu, ctx->irq.irq);
phys_active |= ctx->irq.level;
set_timer_irq_phys_active(ctx, phys_active);
}
static void kvm_timer_vcpu_load_nogic(struct kvm_vcpu *vcpu)
@ -466,28 +525,32 @@ static void kvm_timer_vcpu_load_nogic(struct kvm_vcpu *vcpu)
void kvm_timer_vcpu_load(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
struct timer_map map;
if (unlikely(!timer->enabled))
return;
if (static_branch_likely(&has_gic_active_state))
kvm_timer_vcpu_load_gic(vcpu);
else
get_timer_map(vcpu, &map);
if (static_branch_likely(&has_gic_active_state)) {
kvm_timer_vcpu_load_gic(map.direct_vtimer);
if (map.direct_ptimer)
kvm_timer_vcpu_load_gic(map.direct_ptimer);
} else {
kvm_timer_vcpu_load_nogic(vcpu);
}
set_cntvoff(vtimer->cntvoff);
set_cntvoff(map.direct_vtimer->cntvoff);
vtimer_restore_state(vcpu);
kvm_timer_unblocking(vcpu);
/* Set the background timer for the physical timer emulation. */
phys_timer_emulate(vcpu);
timer_restore_state(map.direct_vtimer);
if (map.direct_ptimer)
timer_restore_state(map.direct_ptimer);
/* If the timer fired while we weren't running, inject it now */
if (kvm_timer_should_fire(ptimer) != ptimer->irq.level)
kvm_timer_update_irq(vcpu, !ptimer->irq.level, ptimer);
if (map.emul_ptimer)
timer_emulate(map.emul_ptimer);
}
bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu)
@ -509,15 +572,20 @@ bool kvm_timer_should_notify_user(struct kvm_vcpu *vcpu)
void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
struct timer_map map;
if (unlikely(!timer->enabled))
return;
vtimer_save_state(vcpu);
get_timer_map(vcpu, &map);
timer_save_state(map.direct_vtimer);
if (map.direct_ptimer)
timer_save_state(map.direct_ptimer);
/*
* Cancel the physical timer emulation, because the only case where we
* Cancel soft timer emulation, because the only case where we
* need it after a vcpu_put is in the context of a sleeping VCPU, and
* in that case we already factor in the deadline for the physical
* timer when scheduling the bg_timer.
@ -525,7 +593,11 @@ void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
* In any case, we re-schedule the hrtimer for the physical timer when
* coming back to the VCPU thread in kvm_timer_vcpu_load().
*/
soft_timer_cancel(&timer->phys_timer);
if (map.emul_ptimer)
soft_timer_cancel(&map.emul_ptimer->hrtimer);
if (swait_active(kvm_arch_vcpu_wq(vcpu)))
kvm_timer_blocking(vcpu);
/*
* The kernel may decide to run userspace after calling vcpu_put, so
@ -534,8 +606,7 @@ void kvm_timer_vcpu_put(struct kvm_vcpu *vcpu)
* counter of non-VHE case. For VHE, the virtual counter uses a fixed
* virtual offset of zero, so no need to zero CNTVOFF_EL2 register.
*/
if (!has_vhe())
set_cntvoff(0);
set_cntvoff(0);
}
/*
@ -550,7 +621,7 @@ static void unmask_vtimer_irq_user(struct kvm_vcpu *vcpu)
if (!kvm_timer_should_fire(vtimer)) {
kvm_timer_update_irq(vcpu, false, vtimer);
if (static_branch_likely(&has_gic_active_state))
set_vtimer_irq_phys_active(vcpu, false);
set_timer_irq_phys_active(vtimer, false);
else
enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags);
}
@ -558,7 +629,7 @@ static void unmask_vtimer_irq_user(struct kvm_vcpu *vcpu)
void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
if (unlikely(!timer->enabled))
return;
@ -569,9 +640,10 @@ void kvm_timer_sync_hwstate(struct kvm_vcpu *vcpu)
int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
struct timer_map map;
get_timer_map(vcpu, &map);
/*
* The bits in CNTV_CTL are architecturally reset to UNKNOWN for ARMv8
@ -579,12 +651,22 @@ int kvm_timer_vcpu_reset(struct kvm_vcpu *vcpu)
* resets the timer to be disabled and unmasked and is compliant with
* the ARMv7 architecture.
*/
vtimer->cnt_ctl = 0;
ptimer->cnt_ctl = 0;
kvm_timer_update_state(vcpu);
vcpu_vtimer(vcpu)->cnt_ctl = 0;
vcpu_ptimer(vcpu)->cnt_ctl = 0;
if (timer->enabled && irqchip_in_kernel(vcpu->kvm))
kvm_vgic_reset_mapped_irq(vcpu, vtimer->irq.irq);
if (timer->enabled) {
kvm_timer_update_irq(vcpu, false, vcpu_vtimer(vcpu));
kvm_timer_update_irq(vcpu, false, vcpu_ptimer(vcpu));
if (irqchip_in_kernel(vcpu->kvm)) {
kvm_vgic_reset_mapped_irq(vcpu, map.direct_vtimer->irq.irq);
if (map.direct_ptimer)
kvm_vgic_reset_mapped_irq(vcpu, map.direct_ptimer->irq.irq);
}
}
if (map.emul_ptimer)
soft_timer_cancel(&map.emul_ptimer->hrtimer);
return 0;
}
@ -610,56 +692,76 @@ static void update_vtimer_cntvoff(struct kvm_vcpu *vcpu, u64 cntvoff)
void kvm_timer_vcpu_init(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
/* Synchronize cntvoff across all vtimers of a VM. */
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read());
vcpu_ptimer(vcpu)->cntvoff = 0;
ptimer->cntvoff = 0;
hrtimer_init(&timer->bg_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
timer->bg_timer.function = kvm_bg_timer_expire;
hrtimer_init(&timer->phys_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
timer->phys_timer.function = kvm_phys_timer_expire;
hrtimer_init(&vtimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
hrtimer_init(&ptimer->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
vtimer->hrtimer.function = kvm_hrtimer_expire;
ptimer->hrtimer.function = kvm_hrtimer_expire;
vtimer->irq.irq = default_vtimer_irq.irq;
ptimer->irq.irq = default_ptimer_irq.irq;
vtimer->host_timer_irq = host_vtimer_irq;
ptimer->host_timer_irq = host_ptimer_irq;
vtimer->host_timer_irq_flags = host_vtimer_irq_flags;
ptimer->host_timer_irq_flags = host_ptimer_irq_flags;
vtimer->vcpu = vcpu;
ptimer->vcpu = vcpu;
}
static void kvm_timer_init_interrupt(void *info)
{
enable_percpu_irq(host_vtimer_irq, host_vtimer_irq_flags);
enable_percpu_irq(host_ptimer_irq, host_ptimer_irq_flags);
}
int kvm_arm_timer_set_reg(struct kvm_vcpu *vcpu, u64 regid, u64 value)
{
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
struct arch_timer_context *timer;
bool level;
switch (regid) {
case KVM_REG_ARM_TIMER_CTL:
vtimer->cnt_ctl = value & ~ARCH_TIMER_CTRL_IT_STAT;
timer = vcpu_vtimer(vcpu);
kvm_arm_timer_write(vcpu, timer, TIMER_REG_CTL, value);
break;
case KVM_REG_ARM_TIMER_CNT:
timer = vcpu_vtimer(vcpu);
update_vtimer_cntvoff(vcpu, kvm_phys_timer_read() - value);
break;
case KVM_REG_ARM_TIMER_CVAL:
vtimer->cnt_cval = value;
timer = vcpu_vtimer(vcpu);
kvm_arm_timer_write(vcpu, timer, TIMER_REG_CVAL, value);
break;
case KVM_REG_ARM_PTIMER_CTL:
ptimer->cnt_ctl = value & ~ARCH_TIMER_CTRL_IT_STAT;
timer = vcpu_ptimer(vcpu);
kvm_arm_timer_write(vcpu, timer, TIMER_REG_CTL, value);
break;
case KVM_REG_ARM_PTIMER_CVAL:
ptimer->cnt_cval = value;
timer = vcpu_ptimer(vcpu);
kvm_arm_timer_write(vcpu, timer, TIMER_REG_CVAL, value);
break;
default:
return -1;
}
kvm_timer_update_state(vcpu);
level = kvm_timer_should_fire(timer);
kvm_timer_update_irq(vcpu, level, timer);
timer_emulate(timer);
return 0;
}
@ -679,26 +781,113 @@ static u64 read_timer_ctl(struct arch_timer_context *timer)
u64 kvm_arm_timer_get_reg(struct kvm_vcpu *vcpu, u64 regid)
{
struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
switch (regid) {
case KVM_REG_ARM_TIMER_CTL:
return read_timer_ctl(vtimer);
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CTL);
case KVM_REG_ARM_TIMER_CNT:
return kvm_phys_timer_read() - vtimer->cntvoff;
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CNT);
case KVM_REG_ARM_TIMER_CVAL:
return vtimer->cnt_cval;
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CVAL);
case KVM_REG_ARM_PTIMER_CTL:
return read_timer_ctl(ptimer);
case KVM_REG_ARM_PTIMER_CVAL:
return ptimer->cnt_cval;
return kvm_arm_timer_read(vcpu,
vcpu_ptimer(vcpu), TIMER_REG_CTL);
case KVM_REG_ARM_PTIMER_CNT:
return kvm_phys_timer_read();
return kvm_arm_timer_read(vcpu,
vcpu_vtimer(vcpu), TIMER_REG_CNT);
case KVM_REG_ARM_PTIMER_CVAL:
return kvm_arm_timer_read(vcpu,
vcpu_ptimer(vcpu), TIMER_REG_CVAL);
}
return (u64)-1;
}
static u64 kvm_arm_timer_read(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg)
{
u64 val;
switch (treg) {
case TIMER_REG_TVAL:
val = kvm_phys_timer_read() - timer->cntvoff - timer->cnt_cval;
break;
case TIMER_REG_CTL:
val = read_timer_ctl(timer);
break;
case TIMER_REG_CVAL:
val = timer->cnt_cval;
break;
case TIMER_REG_CNT:
val = kvm_phys_timer_read() - timer->cntvoff;
break;
default:
BUG();
}
return val;
}
u64 kvm_arm_timer_read_sysreg(struct kvm_vcpu *vcpu,
enum kvm_arch_timers tmr,
enum kvm_arch_timer_regs treg)
{
u64 val;
preempt_disable();
kvm_timer_vcpu_put(vcpu);
val = kvm_arm_timer_read(vcpu, vcpu_get_timer(vcpu, tmr), treg);
kvm_timer_vcpu_load(vcpu);
preempt_enable();
return val;
}
static void kvm_arm_timer_write(struct kvm_vcpu *vcpu,
struct arch_timer_context *timer,
enum kvm_arch_timer_regs treg,
u64 val)
{
switch (treg) {
case TIMER_REG_TVAL:
timer->cnt_cval = val - kvm_phys_timer_read() - timer->cntvoff;
break;
case TIMER_REG_CTL:
timer->cnt_ctl = val & ~ARCH_TIMER_CTRL_IT_STAT;
break;
case TIMER_REG_CVAL:
timer->cnt_cval = val;
break;
default:
BUG();
}
}
void kvm_arm_timer_write_sysreg(struct kvm_vcpu *vcpu,
enum kvm_arch_timers tmr,
enum kvm_arch_timer_regs treg,
u64 val)
{
preempt_disable();
kvm_timer_vcpu_put(vcpu);
kvm_arm_timer_write(vcpu, vcpu_get_timer(vcpu, tmr), treg, val);
kvm_timer_vcpu_load(vcpu);
preempt_enable();
}
static int kvm_timer_starting_cpu(unsigned int cpu)
{
kvm_timer_init_interrupt(NULL);
@ -724,6 +913,8 @@ int kvm_timer_hyp_init(bool has_gic)
return -ENODEV;
}
/* First, do the virtual EL1 timer irq */
if (info->virtual_irq <= 0) {
kvm_err("kvm_arch_timer: invalid virtual timer IRQ: %d\n",
info->virtual_irq);
@ -734,15 +925,15 @@ int kvm_timer_hyp_init(bool has_gic)
host_vtimer_irq_flags = irq_get_trigger_type(host_vtimer_irq);
if (host_vtimer_irq_flags != IRQF_TRIGGER_HIGH &&
host_vtimer_irq_flags != IRQF_TRIGGER_LOW) {
kvm_err("Invalid trigger for IRQ%d, assuming level low\n",
kvm_err("Invalid trigger for vtimer IRQ%d, assuming level low\n",
host_vtimer_irq);
host_vtimer_irq_flags = IRQF_TRIGGER_LOW;
}
err = request_percpu_irq(host_vtimer_irq, kvm_arch_timer_handler,
"kvm guest timer", kvm_get_running_vcpus());
"kvm guest vtimer", kvm_get_running_vcpus());
if (err) {
kvm_err("kvm_arch_timer: can't request interrupt %d (%d)\n",
kvm_err("kvm_arch_timer: can't request vtimer interrupt %d (%d)\n",
host_vtimer_irq, err);
return err;
}
@ -760,6 +951,43 @@ int kvm_timer_hyp_init(bool has_gic)
kvm_debug("virtual timer IRQ%d\n", host_vtimer_irq);
/* Now let's do the physical EL1 timer irq */
if (info->physical_irq > 0) {
host_ptimer_irq = info->physical_irq;
host_ptimer_irq_flags = irq_get_trigger_type(host_ptimer_irq);
if (host_ptimer_irq_flags != IRQF_TRIGGER_HIGH &&
host_ptimer_irq_flags != IRQF_TRIGGER_LOW) {
kvm_err("Invalid trigger for ptimer IRQ%d, assuming level low\n",
host_ptimer_irq);
host_ptimer_irq_flags = IRQF_TRIGGER_LOW;
}
err = request_percpu_irq(host_ptimer_irq, kvm_arch_timer_handler,
"kvm guest ptimer", kvm_get_running_vcpus());
if (err) {
kvm_err("kvm_arch_timer: can't request ptimer interrupt %d (%d)\n",
host_ptimer_irq, err);
return err;
}
if (has_gic) {
err = irq_set_vcpu_affinity(host_ptimer_irq,
kvm_get_running_vcpus());
if (err) {
kvm_err("kvm_arch_timer: error setting vcpu affinity\n");
goto out_free_irq;
}
}
kvm_debug("physical timer IRQ%d\n", host_ptimer_irq);
} else if (has_vhe()) {
kvm_err("kvm_arch_timer: invalid physical timer IRQ: %d\n",
info->physical_irq);
err = -ENODEV;
goto out_free_irq;
}
cpuhp_setup_state(CPUHP_AP_KVM_ARM_TIMER_STARTING,
"kvm/arm/timer:starting", kvm_timer_starting_cpu,
kvm_timer_dying_cpu);
@ -771,7 +999,7 @@ int kvm_timer_hyp_init(bool has_gic)
void kvm_timer_vcpu_terminate(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
soft_timer_cancel(&timer->bg_timer);
}
@ -807,16 +1035,18 @@ bool kvm_arch_timer_get_input_level(int vintid)
if (vintid == vcpu_vtimer(vcpu)->irq.irq)
timer = vcpu_vtimer(vcpu);
else if (vintid == vcpu_ptimer(vcpu)->irq.irq)
timer = vcpu_ptimer(vcpu);
else
BUG(); /* We only map the vtimer so far */
BUG();
return kvm_timer_should_fire(timer);
}
int kvm_timer_enable(struct kvm_vcpu *vcpu)
{
struct arch_timer_cpu *timer = &vcpu->arch.timer_cpu;
struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
struct arch_timer_cpu *timer = vcpu_timer(vcpu);
struct timer_map map;
int ret;
if (timer->enabled)
@ -834,19 +1064,33 @@ int kvm_timer_enable(struct kvm_vcpu *vcpu)
return -EINVAL;
}
ret = kvm_vgic_map_phys_irq(vcpu, host_vtimer_irq, vtimer->irq.irq,
get_timer_map(vcpu, &map);
ret = kvm_vgic_map_phys_irq(vcpu,
map.direct_vtimer->host_timer_irq,
map.direct_vtimer->irq.irq,
kvm_arch_timer_get_input_level);
if (ret)
return ret;
if (map.direct_ptimer) {
ret = kvm_vgic_map_phys_irq(vcpu,
map.direct_ptimer->host_timer_irq,
map.direct_ptimer->irq.irq,
kvm_arch_timer_get_input_level);
}
if (ret)
return ret;
no_vgic:
timer->enabled = 1;
return 0;
}
/*
* On VHE system, we only need to configure trap on physical timer and counter
* accesses in EL0 and EL1 once, not for every world switch.
* On VHE system, we only need to configure the EL2 timer trap register once,
* not for every world switch.
* The host kernel runs at EL2 with HCR_EL2.TGE == 1,
* and this makes those bits have no effect for the host kernel execution.
*/
@ -857,11 +1101,11 @@ void kvm_timer_init_vhe(void)
u64 val;
/*
* Disallow physical timer access for the guest.
* Physical counter access is allowed.
* VHE systems allow the guest direct access to the EL1 physical
* timer/counter.
*/
val = read_sysreg(cnthctl_el2);
val &= ~(CNTHCTL_EL1PCEN << cnthctl_shift);
val |= (CNTHCTL_EL1PCEN << cnthctl_shift);
val |= (CNTHCTL_EL1PCTEN << cnthctl_shift);
write_sysreg(val, cnthctl_el2);
}

64
virt/kvm/arm/arm.c
View File

@ -65,7 +65,6 @@ static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
/* The VMID used in the VTTBR */
static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
static u32 kvm_next_vmid;
static unsigned int kvm_vmid_bits __read_mostly;
static DEFINE_SPINLOCK(kvm_vmid_lock);
static bool vgic_present;
@ -142,7 +141,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm_vgic_early_init(kvm);
/* Mark the initial VMID generation invalid */
kvm->arch.vmid_gen = 0;
kvm->arch.vmid.vmid_gen = 0;
/* The maximum number of VCPUs is limited by the host's GIC model */
kvm->arch.max_vcpus = vgic_present ?
@ -336,13 +335,11 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
kvm_timer_schedule(vcpu);
kvm_vgic_v4_enable_doorbell(vcpu);
}
void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
kvm_timer_unschedule(vcpu);
kvm_vgic_v4_disable_doorbell(vcpu);
}
@ -472,37 +469,31 @@ void force_vm_exit(const cpumask_t *mask)
/**
* need_new_vmid_gen - check that the VMID is still valid
* @kvm: The VM's VMID to check
* @vmid: The VMID to check
*
* return true if there is a new generation of VMIDs being used
*
* The hardware supports only 256 values with the value zero reserved for the
* host, so we check if an assigned value belongs to a previous generation,
* which which requires us to assign a new value. If we're the first to use a
* VMID for the new generation, we must flush necessary caches and TLBs on all
* CPUs.
* The hardware supports a limited set of values with the value zero reserved
* for the host, so we check if an assigned value belongs to a previous
* generation, which which requires us to assign a new value. If we're the
* first to use a VMID for the new generation, we must flush necessary caches
* and TLBs on all CPUs.
*/
static bool need_new_vmid_gen(struct kvm *kvm)
static bool need_new_vmid_gen(struct kvm_vmid *vmid)
{
u64 current_vmid_gen = atomic64_read(&kvm_vmid_gen);
smp_rmb(); /* Orders read of kvm_vmid_gen and kvm->arch.vmid */
return unlikely(READ_ONCE(kvm->arch.vmid_gen) != current_vmid_gen);
return unlikely(READ_ONCE(vmid->vmid_gen) != current_vmid_gen);
}
/**
* update_vttbr - Update the VTTBR with a valid VMID before the guest runs
* @kvm The guest that we are about to run
*
* Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
* VM has a valid VMID, otherwise assigns a new one and flushes corresponding
* caches and TLBs.
* update_vmid - Update the vmid with a valid VMID for the current generation
* @kvm: The guest that struct vmid belongs to
* @vmid: The stage-2 VMID information struct
*/
static void update_vttbr(struct kvm *kvm)
static void update_vmid(struct kvm_vmid *vmid)
{
phys_addr_t pgd_phys;
u64 vmid, cnp = kvm_cpu_has_cnp() ? VTTBR_CNP_BIT : 0;
if (!need_new_vmid_gen(kvm))
if (!need_new_vmid_gen(vmid))
return;
spin_lock(&kvm_vmid_lock);
@ -512,7 +503,7 @@ static void update_vttbr(struct kvm *kvm)
* already allocated a valid vmid for this vm, then this vcpu should
* use the same vmid.
*/
if (!need_new_vmid_gen(kvm)) {
if (!need_new_vmid_gen(vmid)) {
spin_unlock(&kvm_vmid_lock);
return;
}
@ -536,18 +527,12 @@ static void update_vttbr(struct kvm *kvm)
kvm_call_hyp(__kvm_flush_vm_context);
}
kvm->arch.vmid = kvm_next_vmid;
vmid->vmid = kvm_next_vmid;
kvm_next_vmid++;
kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
/* update vttbr to be used with the new vmid */
pgd_phys = virt_to_phys(kvm->arch.pgd);
BUG_ON(pgd_phys & ~kvm_vttbr_baddr_mask(kvm));
vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
kvm->arch.vttbr = kvm_phys_to_vttbr(pgd_phys) | vmid | cnp;
kvm_next_vmid &= (1 << kvm_get_vmid_bits()) - 1;
smp_wmb();
WRITE_ONCE(kvm->arch.vmid_gen, atomic64_read(&kvm_vmid_gen));
WRITE_ONCE(vmid->vmid_gen, atomic64_read(&kvm_vmid_gen));
spin_unlock(&kvm_vmid_lock);
}
@ -690,7 +675,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
*/
cond_resched();
update_vttbr(vcpu->kvm);
update_vmid(&vcpu->kvm->arch.vmid);
check_vcpu_requests(vcpu);
@ -739,7 +724,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
*/
smp_store_mb(vcpu->mode, IN_GUEST_MODE);
if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
if (ret <= 0 || need_new_vmid_gen(&vcpu->kvm->arch.vmid) ||
kvm_request_pending(vcpu)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
isb(); /* Ensure work in x_flush_hwstate is committed */
@ -765,7 +750,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
ret = kvm_vcpu_run_vhe(vcpu);
kvm_arm_vhe_guest_exit();
} else {
ret = kvm_call_hyp(__kvm_vcpu_run_nvhe, vcpu);
ret = kvm_call_hyp_ret(__kvm_vcpu_run_nvhe, vcpu);
}
vcpu->mode = OUTSIDE_GUEST_MODE;
@ -1417,10 +1402,6 @@ static inline void hyp_cpu_pm_exit(void)
static int init_common_resources(void)
{
/* set size of VMID supported by CPU */
kvm_vmid_bits = kvm_get_vmid_bits();
kvm_info("%d-bit VMID\n", kvm_vmid_bits);
kvm_set_ipa_limit();
return 0;
@ -1561,6 +1542,7 @@ static int init_hyp_mode(void)
kvm_cpu_context_t *cpu_ctxt;
cpu_ctxt = per_cpu_ptr(&kvm_host_cpu_state, cpu);
kvm_init_host_cpu_context(cpu_ctxt, cpu);
err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
if (err) {
@ -1571,7 +1553,7 @@ static int init_hyp_mode(void)
err = hyp_map_aux_data();
if (err)
kvm_err("Cannot map host auxilary data: %d\n", err);
kvm_err("Cannot map host auxiliary data: %d\n", err);
return 0;

2
virt/kvm/arm/hyp/vgic-v3-sr.c
View File

@ -226,7 +226,7 @@ void __hyp_text __vgic_v3_save_state(struct kvm_vcpu *vcpu)
int i;
u32 elrsr;
elrsr = read_gicreg(ICH_ELSR_EL2);
elrsr = read_gicreg(ICH_ELRSR_EL2);
write_gicreg(cpu_if->vgic_hcr & ~ICH_HCR_EN, ICH_HCR_EL2);

18
virt/kvm/arm/mmu.c
View File

@ -908,6 +908,7 @@ int create_hyp_exec_mappings(phys_addr_t phys_addr, size_t size,
*/
int kvm_alloc_stage2_pgd(struct kvm *kvm)
{
phys_addr_t pgd_phys;
pgd_t *pgd;
if (kvm->arch.pgd != NULL) {
@ -920,7 +921,12 @@ int kvm_alloc_stage2_pgd(struct kvm *kvm)
if (!pgd)
return -ENOMEM;
pgd_phys = virt_to_phys(pgd);
if (WARN_ON(pgd_phys & ~kvm_vttbr_baddr_mask(kvm)))
return -EINVAL;
kvm->arch.pgd = pgd;
kvm->arch.pgd_phys = pgd_phys;
return 0;
}
@ -1008,6 +1014,7 @@ void kvm_free_stage2_pgd(struct kvm *kvm)
unmap_stage2_range(kvm, 0, kvm_phys_size(kvm));
pgd = READ_ONCE(kvm->arch.pgd);
kvm->arch.pgd = NULL;
kvm->arch.pgd_phys = 0;
}
spin_unlock(&kvm->mmu_lock);
@ -1396,14 +1403,6 @@ static bool transparent_hugepage_adjust(kvm_pfn_t *pfnp, phys_addr_t *ipap)
return false;
}
static bool kvm_is_write_fault(struct kvm_vcpu *vcpu)
{
if (kvm_vcpu_trap_is_iabt(vcpu))
return false;
return kvm_vcpu_dabt_iswrite(vcpu);
}
/**
* stage2_wp_ptes - write protect PMD range
* @pmd: pointer to pmd entry
@ -1598,14 +1597,13 @@ static void kvm_send_hwpoison_signal(unsigned long address,
static bool fault_supports_stage2_pmd_mappings(struct kvm_memory_slot *memslot,
unsigned long hva)
{
gpa_t gpa_start, gpa_end;
gpa_t gpa_start;
hva_t uaddr_start, uaddr_end;
size_t size;
size = memslot->npages * PAGE_SIZE;
gpa_start = memslot->base_gfn << PAGE_SHIFT;
gpa_end = gpa_start + size;
uaddr_start = memslot->userspace_addr;
uaddr_end = uaddr_start + size;

107
virt/kvm/arm/trace.h
View File

@ -2,6 +2,7 @@
#if !defined(_TRACE_KVM_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_KVM_H
#include <kvm/arm_arch_timer.h>
#include <linux/tracepoint.h>
#undef TRACE_SYSTEM
@ -262,10 +263,114 @@ TRACE_EVENT(kvm_timer_update_irq,
__entry->vcpu_id, __entry->irq, __entry->level)
);
TRACE_EVENT(kvm_get_timer_map,
TP_PROTO(unsigned long vcpu_id, struct timer_map *map),
TP_ARGS(vcpu_id, map),
TP_STRUCT__entry(
__field( unsigned long, vcpu_id )
__field( int, direct_vtimer )
__field( int, direct_ptimer )
__field( int, emul_ptimer )
),
TP_fast_assign(
__entry->vcpu_id = vcpu_id;
__entry->direct_vtimer = arch_timer_ctx_index(map->direct_vtimer);
__entry->direct_ptimer =
(map->direct_ptimer) ? arch_timer_ctx_index(map->direct_ptimer) : -1;
__entry->emul_ptimer =
(map->emul_ptimer) ? arch_timer_ctx_index(map->emul_ptimer) : -1;
),
TP_printk("VCPU: %ld, dv: %d, dp: %d, ep: %d",
__entry->vcpu_id,
__entry->direct_vtimer,
__entry->direct_ptimer,
__entry->emul_ptimer)
);
TRACE_EVENT(kvm_timer_save_state,
TP_PROTO(struct arch_timer_context *ctx),
TP_ARGS(ctx),
TP_STRUCT__entry(
__field( unsigned long, ctl )
__field( unsigned long long, cval )
__field( int, timer_idx )
),
TP_fast_assign(
__entry->ctl = ctx->cnt_ctl;
__entry->cval = ctx->cnt_cval;
__entry->timer_idx = arch_timer_ctx_index(ctx);
),
TP_printk(" CTL: %#08lx CVAL: %#16llx arch_timer_ctx_index: %d",
__entry->ctl,
__entry->cval,
__entry->timer_idx)
);
TRACE_EVENT(kvm_timer_restore_state,
TP_PROTO(struct arch_timer_context *ctx),
TP_ARGS(ctx),
TP_STRUCT__entry(
__field( unsigned long, ctl )
__field( unsigned long long, cval )
__field( int, timer_idx )
),
TP_fast_assign(
__entry->ctl = ctx->cnt_ctl;
__entry->cval = ctx->cnt_cval;
__entry->timer_idx = arch_timer_ctx_index(ctx);
),
TP_printk("CTL: %#08lx CVAL: %#16llx arch_timer_ctx_index: %d",
__entry->ctl,
__entry->cval,
__entry->timer_idx)
);
TRACE_EVENT(kvm_timer_hrtimer_expire,
TP_PROTO(struct arch_timer_context *ctx),
TP_ARGS(ctx),
TP_STRUCT__entry(
__field( int, timer_idx )
),
TP_fast_assign(
__entry->timer_idx = arch_timer_ctx_index(ctx);
),
TP_printk("arch_timer_ctx_index: %d", __entry->timer_idx)
);
TRACE_EVENT(kvm_timer_emulate,
TP_PROTO(struct arch_timer_context *ctx, bool should_fire),
TP_ARGS(ctx, should_fire),
TP_STRUCT__entry(
__field( int, timer_idx )
__field( bool, should_fire )
),
TP_fast_assign(
__entry->timer_idx = arch_timer_ctx_index(ctx);
__entry->should_fire = should_fire;
),
TP_printk("arch_timer_ctx_index: %d (should_fire: %d)",
__entry->timer_idx, __entry->should_fire)
);
#endif /* _TRACE_KVM_H */
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH ../../../virt/kvm/arm
#define TRACE_INCLUDE_PATH ../../virt/kvm/arm
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE trace

4
virt/kvm/arm/vgic/vgic-v3.c
View File

@ -589,7 +589,7 @@ early_param("kvm-arm.vgic_v4_enable", early_gicv4_enable);
*/
int vgic_v3_probe(const struct gic_kvm_info *info)
{
u32 ich_vtr_el2 = kvm_call_hyp(__vgic_v3_get_ich_vtr_el2);
u32 ich_vtr_el2 = kvm_call_hyp_ret(__vgic_v3_get_ich_vtr_el2);
int ret;
/*
@ -679,7 +679,7 @@ void vgic_v3_put(struct kvm_vcpu *vcpu)
struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3;
if (likely(cpu_if->vgic_sre))
cpu_if->vgic_vmcr = kvm_call_hyp(__vgic_v3_read_vmcr);
cpu_if->vgic_vmcr = kvm_call_hyp_ret(__vgic_v3_read_vmcr);
kvm_call_hyp(__vgic_v3_save_aprs, vcpu);