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KVM: arm/arm64: Context-switch ptrauth registers 

When pointer authentication is supported, a guest may wish to use it.
This patch adds the necessary KVM infrastructure for this to work, with
a semi-lazy context switch of the pointer auth state.

Pointer authentication feature is only enabled when VHE is built
in the kernel and present in the CPU implementation so only VHE code
paths are modified.

When we schedule a vcpu, we disable guest usage of pointer
authentication instructions and accesses to the keys. While these are
disabled, we avoid context-switching the keys. When we trap the guest
trying to use pointer authentication functionality, we change to eagerly
context-switching the keys, and enable the feature. The next time the
vcpu is scheduled out/in, we start again. However the host key save is
optimized and implemented inside ptrauth instruction/register access
trap.

Pointer authentication consists of address authentication and generic
authentication, and CPUs in a system might have varied support for
either. Where support for either feature is not uniform, it is hidden
from guests via ID register emulation, as a result of the cpufeature
framework in the host.

Unfortunately, address authentication and generic authentication cannot
be trapped separately, as the architecture provides a single EL2 trap
covering both. If we wish to expose one without the other, we cannot
prevent a (badly-written) guest from intermittently using a feature
which is not uniformly supported (when scheduled on a physical CPU which
supports the relevant feature). Hence, this patch expects both type of
authentication to be present in a cpu.

This switch of key is done from guest enter/exit assembly as preparation
for the upcoming in-kernel pointer authentication support. Hence, these
key switching routines are not implemented in C code as they may cause
pointer authentication key signing error in some situations.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
[Only VHE, key switch in full assembly, vcpu_has_ptrauth checks
, save host key in ptrauth exception trap]
Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com>
Reviewed-by: Julien Thierry <julien.thierry@arm.com>
Cc: Christoffer Dall <christoffer.dall@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
[maz: various fixups]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Mark Rutland 2019-04-23 10:12:35 +05:30 committed by Marc Zyngier
parent b890d75c4c
commit 384b40caa8
10 changed files with 240 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/include/asm/kvm_emulate.h
View File

@ -343,4 +343,6 @@ static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
}
}
static inline void vcpu_ptrauth_setup_lazy(struct kvm_vcpu *vcpu) {}
#endif /* __ARM_KVM_EMULATE_H__ */

6
arch/arm64/Kconfig
View File

@ -1288,6 +1288,7 @@ menu "ARMv8.3 architectural features"
config ARM64_PTR_AUTH
bool "Enable support for pointer authentication"
default y
depends on !KVM || ARM64_VHE
help
Pointer authentication (part of the ARMv8.3 Extensions) provides
instructions for signing and authenticating pointers against secret
@ -1301,8 +1302,9 @@ config ARM64_PTR_AUTH
context-switched along with the process.
The feature is detected at runtime. If the feature is not present in
hardware it will not be advertised to userspace nor will it be
enabled.
hardware it will not be advertised to userspace/KVM guest nor will it
be enabled. However, KVM guest also require VHE mode and hence
CONFIG_ARM64_VHE=y option to use this feature.
endmenu

16
arch/arm64/include/asm/kvm_emulate.h
View File

@ -98,6 +98,22 @@ static inline void vcpu_set_wfe_traps(struct kvm_vcpu *vcpu)
vcpu->arch.hcr_el2 |= HCR_TWE;
}
static inline void vcpu_ptrauth_enable(struct kvm_vcpu *vcpu)
{
vcpu->arch.hcr_el2 |= (HCR_API | HCR_APK);
}
static inline void vcpu_ptrauth_disable(struct kvm_vcpu *vcpu)
{
vcpu->arch.hcr_el2 &= ~(HCR_API | HCR_APK);
}
static inline void vcpu_ptrauth_setup_lazy(struct kvm_vcpu *vcpu)
{
if (vcpu_has_ptrauth(vcpu))
vcpu_ptrauth_disable(vcpu);
}
static inline unsigned long vcpu_get_vsesr(struct kvm_vcpu *vcpu)
{
return vcpu->arch.vsesr_el2;

14
arch/arm64/include/asm/kvm_host.h
View File

@ -161,6 +161,18 @@ enum vcpu_sysreg {
PMSWINC_EL0, /* Software Increment Register */
PMUSERENR_EL0, /* User Enable Register */
/* Pointer Authentication Registers in a strict increasing order. */
APIAKEYLO_EL1,
APIAKEYHI_EL1,
APIBKEYLO_EL1,
APIBKEYHI_EL1,
APDAKEYLO_EL1,
APDAKEYHI_EL1,
APDBKEYLO_EL1,
APDBKEYHI_EL1,
APGAKEYLO_EL1,
APGAKEYHI_EL1,
/* 32bit specific registers. Keep them at the end of the range */
DACR32_EL2, /* Domain Access Control Register */
IFSR32_EL2, /* Instruction Fault Status Register */
@ -530,6 +542,8 @@ static inline bool kvm_arch_requires_vhe(void)
return false;
}
void kvm_arm_vcpu_ptrauth_trap(struct kvm_vcpu *vcpu);
static inline void kvm_arch_hardware_unsetup(void) {}
static inline void kvm_arch_sync_events(struct kvm *kvm) {}
static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}

111
arch/arm64/include/asm/kvm_ptrauth.h Normal file
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@ -0,0 +1,111 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* arch/arm64/include/asm/kvm_ptrauth.h: Guest/host ptrauth save/restore
* Copyright 2019 Arm Limited
* Authors: Mark Rutland <mark.rutland@arm.com>
* Amit Daniel Kachhap <amit.kachhap@arm.com>
*/
#ifndef __ASM_KVM_PTRAUTH_H
#define __ASM_KVM_PTRAUTH_H
#ifdef __ASSEMBLY__
#include <asm/sysreg.h>
#ifdef CONFIG_ARM64_PTR_AUTH
#define PTRAUTH_REG_OFFSET(x) (x - CPU_APIAKEYLO_EL1)
/*
* CPU_AP*_EL1 values exceed immediate offset range (512) for stp
* instruction so below macros takes CPU_APIAKEYLO_EL1 as base and
* calculates the offset of the keys from this base to avoid an extra add
* instruction. These macros assumes the keys offsets follow the order of
* the sysreg enum in kvm_host.h.
*/
.macro ptrauth_save_state base, reg1, reg2
mrs_s \reg1, SYS_APIAKEYLO_EL1
mrs_s \reg2, SYS_APIAKEYHI_EL1
stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIAKEYLO_EL1)]
mrs_s \reg1, SYS_APIBKEYLO_EL1
mrs_s \reg2, SYS_APIBKEYHI_EL1
stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIBKEYLO_EL1)]
mrs_s \reg1, SYS_APDAKEYLO_EL1
mrs_s \reg2, SYS_APDAKEYHI_EL1
stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDAKEYLO_EL1)]
mrs_s \reg1, SYS_APDBKEYLO_EL1
mrs_s \reg2, SYS_APDBKEYHI_EL1
stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDBKEYLO_EL1)]
mrs_s \reg1, SYS_APGAKEYLO_EL1
mrs_s \reg2, SYS_APGAKEYHI_EL1
stp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APGAKEYLO_EL1)]
.endm
.macro ptrauth_restore_state base, reg1, reg2
ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIAKEYLO_EL1)]
msr_s SYS_APIAKEYLO_EL1, \reg1
msr_s SYS_APIAKEYHI_EL1, \reg2
ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APIBKEYLO_EL1)]
msr_s SYS_APIBKEYLO_EL1, \reg1
msr_s SYS_APIBKEYHI_EL1, \reg2
ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDAKEYLO_EL1)]
msr_s SYS_APDAKEYLO_EL1, \reg1
msr_s SYS_APDAKEYHI_EL1, \reg2
ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APDBKEYLO_EL1)]
msr_s SYS_APDBKEYLO_EL1, \reg1
msr_s SYS_APDBKEYHI_EL1, \reg2
ldp \reg1, \reg2, [\base, #PTRAUTH_REG_OFFSET(CPU_APGAKEYLO_EL1)]
msr_s SYS_APGAKEYLO_EL1, \reg1
msr_s SYS_APGAKEYHI_EL1, \reg2
.endm
/*
* Both ptrauth_switch_to_guest and ptrauth_switch_to_host macros will
* check for the presence of one of the cpufeature flag
* ARM64_HAS_ADDRESS_AUTH_ARCH or ARM64_HAS_ADDRESS_AUTH_IMP_DEF and
* then proceed ahead with the save/restore of Pointer Authentication
* key registers.
*/
.macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3
alternative_if ARM64_HAS_ADDRESS_AUTH_ARCH
b 1000f
alternative_else_nop_endif
alternative_if_not ARM64_HAS_ADDRESS_AUTH_IMP_DEF
b 1001f
alternative_else_nop_endif
1000:
ldr \reg1, [\g_ctxt, #(VCPU_HCR_EL2 - VCPU_CONTEXT)]
and \reg1, \reg1, #(HCR_API | HCR_APK)
cbz \reg1, 1001f
add \reg1, \g_ctxt, #CPU_APIAKEYLO_EL1
ptrauth_restore_state \reg1, \reg2, \reg3
1001:
.endm
.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
alternative_if ARM64_HAS_ADDRESS_AUTH_ARCH
b 2000f
alternative_else_nop_endif
alternative_if_not ARM64_HAS_ADDRESS_AUTH_IMP_DEF
b 2001f
alternative_else_nop_endif
2000:
ldr \reg1, [\g_ctxt, #(VCPU_HCR_EL2 - VCPU_CONTEXT)]
and \reg1, \reg1, #(HCR_API | HCR_APK)
cbz \reg1, 2001f
add \reg1, \g_ctxt, #CPU_APIAKEYLO_EL1
ptrauth_save_state \reg1, \reg2, \reg3
add \reg1, \h_ctxt, #CPU_APIAKEYLO_EL1
ptrauth_restore_state \reg1, \reg2, \reg3
isb
2001:
.endm
#else /* !CONFIG_ARM64_PTR_AUTH */
.macro ptrauth_switch_to_guest g_ctxt, reg1, reg2, reg3
.endm
.macro ptrauth_switch_to_host g_ctxt, h_ctxt, reg1, reg2, reg3
.endm
#endif /* CONFIG_ARM64_PTR_AUTH */
#endif /* __ASSEMBLY__ */
#endif /* __ASM_KVM_PTRAUTH_H */

6
arch/arm64/kernel/asm-offsets.c
View File

@ -125,7 +125,13 @@ int main(void)
DEFINE(VCPU_CONTEXT, offsetof(struct kvm_vcpu, arch.ctxt));
DEFINE(VCPU_FAULT_DISR, offsetof(struct kvm_vcpu, arch.fault.disr_el1));
DEFINE(VCPU_WORKAROUND_FLAGS, offsetof(struct kvm_vcpu, arch.workaround_flags));
DEFINE(VCPU_HCR_EL2, offsetof(struct kvm_vcpu, arch.hcr_el2));
DEFINE(CPU_GP_REGS, offsetof(struct kvm_cpu_context, gp_regs));
DEFINE(CPU_APIAKEYLO_EL1, offsetof(struct kvm_cpu_context, sys_regs[APIAKEYLO_EL1]));
DEFINE(CPU_APIBKEYLO_EL1, offsetof(struct kvm_cpu_context, sys_regs[APIBKEYLO_EL1]));
DEFINE(CPU_APDAKEYLO_EL1, offsetof(struct kvm_cpu_context, sys_regs[APDAKEYLO_EL1]));
DEFINE(CPU_APDBKEYLO_EL1, offsetof(struct kvm_cpu_context, sys_regs[APDBKEYLO_EL1]));
DEFINE(CPU_APGAKEYLO_EL1, offsetof(struct kvm_cpu_context, sys_regs[APGAKEYLO_EL1]));
DEFINE(CPU_USER_PT_REGS, offsetof(struct kvm_regs, regs));
DEFINE(HOST_CONTEXT_VCPU, offsetof(struct kvm_cpu_context, __hyp_running_vcpu));
#endif

36
arch/arm64/kvm/handle_exit.c
View File

@ -173,20 +173,40 @@ static int handle_sve(struct kvm_vcpu *vcpu, struct kvm_run *run)
return 1;
}
#define __ptrauth_save_key(regs, key) \
({ \
regs[key ## KEYLO_EL1] = read_sysreg_s(SYS_ ## key ## KEYLO_EL1); \
regs[key ## KEYHI_EL1] = read_sysreg_s(SYS_ ## key ## KEYHI_EL1); \
})
/*
* Handle the guest trying to use a ptrauth instruction, or trying to access a
* ptrauth register.
*/
void kvm_arm_vcpu_ptrauth_trap(struct kvm_vcpu *vcpu)
{
struct kvm_cpu_context *ctxt;
if (vcpu_has_ptrauth(vcpu)) {
vcpu_ptrauth_enable(vcpu);
ctxt = vcpu->arch.host_cpu_context;
__ptrauth_save_key(ctxt->sys_regs, APIA);
__ptrauth_save_key(ctxt->sys_regs, APIB);
__ptrauth_save_key(ctxt->sys_regs, APDA);
__ptrauth_save_key(ctxt->sys_regs, APDB);
__ptrauth_save_key(ctxt->sys_regs, APGA);
} else {
kvm_inject_undefined(vcpu);
}
}
/*
* Guest usage of a ptrauth instruction (which the guest EL1 did not turn into
* a NOP).
*/
static int kvm_handle_ptrauth(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
/*
* We don't currently support ptrauth in a guest, and we mask the ID
* registers to prevent well-behaved guests from trying to make use of
* it.
*
* Inject an UNDEF, as if the feature really isn't present.
*/
kvm_inject_undefined(vcpu);
kvm_arm_vcpu_ptrauth_trap(vcpu);
return 1;
}

15
arch/arm64/kvm/hyp/entry.S
View File

@ -24,6 +24,7 @@
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_ptrauth.h>
#define CPU_GP_REG_OFFSET(x) (CPU_GP_REGS + x)
#define CPU_XREG_OFFSET(x) CPU_GP_REG_OFFSET(CPU_USER_PT_REGS + 8*x)
@ -64,6 +65,13 @@ ENTRY(__guest_enter)
add x18, x0, #VCPU_CONTEXT
// Macro ptrauth_switch_to_guest format:
// ptrauth_switch_to_guest(guest cxt, tmp1, tmp2, tmp3)
// The below macro to restore guest keys is not implemented in C code
// as it may cause Pointer Authentication key signing mismatch errors
// when this feature is enabled for kernel code.
ptrauth_switch_to_guest x18, x0, x1, x2
// Restore guest regs x0-x17
ldp x0, x1, [x18, #CPU_XREG_OFFSET(0)]
ldp x2, x3, [x18, #CPU_XREG_OFFSET(2)]
@ -118,6 +126,13 @@ ENTRY(__guest_exit)
get_host_ctxt x2, x3
// Macro ptrauth_switch_to_guest format:
// ptrauth_switch_to_host(guest cxt, host cxt, tmp1, tmp2, tmp3)
// The below macro to save/restore keys is not implemented in C code
// as it may cause Pointer Authentication key signing mismatch errors
// when this feature is enabled for kernel code.
ptrauth_switch_to_host x1, x2, x3, x4, x5
// Now restore the host regs
restore_callee_saved_regs x2

50
arch/arm64/kvm/sys_regs.c
View File

@ -1007,6 +1007,37 @@ 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 trap_ptrauth(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *rd)
{
kvm_arm_vcpu_ptrauth_trap(vcpu);
/*
* Return false for both cases as we never skip the trapped
* instruction:
*
* - Either we re-execute the same key register access instruction
* after enabling ptrauth.
* - Or an UNDEF is injected as ptrauth is not supported/enabled.
*/
return false;
}
static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd)
{
return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN_USER | REG_HIDDEN_GUEST;
}
#define __PTRAUTH_KEY(k) \
{ SYS_DESC(SYS_## k), trap_ptrauth, reset_unknown, k, \
.visibility = ptrauth_visibility}
#define PTRAUTH_KEY(k) \
__PTRAUTH_KEY(k ## KEYLO_EL1), \
__PTRAUTH_KEY(k ## KEYHI_EL1)
static bool access_arch_timer(struct kvm_vcpu *vcpu,
struct sys_reg_params *p,
const struct sys_reg_desc *r)
@ -1053,14 +1084,11 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
if (id == SYS_ID_AA64PFR0_EL1 && !vcpu_has_sve(vcpu)) {
val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
} else if (id == SYS_ID_AA64ISAR1_EL1) {
const u64 ptrauth_mask = (0xfUL << ID_AA64ISAR1_APA_SHIFT) |
(0xfUL << ID_AA64ISAR1_API_SHIFT) |
(0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
(0xfUL << ID_AA64ISAR1_GPI_SHIFT);
if (val & ptrauth_mask)
kvm_debug("ptrauth unsupported for guests, suppressing\n");
val &= ~ptrauth_mask;
} else if (id == SYS_ID_AA64ISAR1_EL1 && !vcpu_has_ptrauth(vcpu)) {
val &= ~(0xfUL << ID_AA64ISAR1_APA_SHIFT) |
(0xfUL << ID_AA64ISAR1_API_SHIFT) |
(0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
(0xfUL << ID_AA64ISAR1_GPI_SHIFT);
}
return val;
@ -1460,6 +1488,12 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 },
{ SYS_DESC(SYS_TCR_EL1), access_vm_reg, reset_val, TCR_EL1, 0 },
PTRAUTH_KEY(APIA),
PTRAUTH_KEY(APIB),
PTRAUTH_KEY(APDA),
PTRAUTH_KEY(APDB),
PTRAUTH_KEY(APGA),
{ SYS_DESC(SYS_AFSR0_EL1), access_vm_reg, reset_unknown, AFSR0_EL1 },
{ SYS_DESC(SYS_AFSR1_EL1), access_vm_reg, reset_unknown, AFSR1_EL1 },
{ SYS_DESC(SYS_ESR_EL1), access_vm_reg, reset_unknown, ESR_EL1 },

2
virt/kvm/arm/arm.c
View File

@ -385,6 +385,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
vcpu_clear_wfe_traps(vcpu);
else
vcpu_set_wfe_traps(vcpu);
vcpu_ptrauth_setup_lazy(vcpu);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)