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arm64: KVM: VHE: Differenciate host/guest sysreg save/restore 

With ARMv8, host and guest share the same system register file,
making the save/restore procedure completely symetrical.
With VHE, host and guest now have different requirements, as they
use different sysregs.

In order to prepare for this, add split sysreg save/restore functions
for both host and guest. No functional changes yet.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2015-10-28 12:17:35 +00:00
parent 915ccd1dbf
commit edef528dc4
3 changed files with 31 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm64/kvm/hyp/hyp.h
View File

@ -153,8 +153,10 @@ void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
void __timer_save_state(struct kvm_vcpu *vcpu);
void __timer_restore_state(struct kvm_vcpu *vcpu);
void __sysreg_save_state(struct kvm_cpu_context *ctxt);
void __sysreg_restore_state(struct kvm_cpu_context *ctxt);
void __sysreg_save_host_state(struct kvm_cpu_context *ctxt);
void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt);
void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
void __sysreg32_save_state(struct kvm_vcpu *vcpu);
void __sysreg32_restore_state(struct kvm_vcpu *vcpu);

10
arch/arm64/kvm/hyp/switch.c
View File

@ -102,7 +102,7 @@ static int __hyp_text __guest_run(struct kvm_vcpu *vcpu)
host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context);
guest_ctxt = &vcpu->arch.ctxt;
__sysreg_save_state(host_ctxt);
__sysreg_save_host_state(host_ctxt);
__debug_cond_save_host_state(vcpu);
__activate_traps(vcpu);
@ -116,7 +116,7 @@ static int __hyp_text __guest_run(struct kvm_vcpu *vcpu)
* to Cortex-A57 erratum #852523.
*/
__sysreg32_restore_state(vcpu);
__sysreg_restore_state(guest_ctxt);
__sysreg_restore_guest_state(guest_ctxt);
__debug_restore_state(vcpu, kern_hyp_va(vcpu->arch.debug_ptr), guest_ctxt);
/* Jump in the fire! */
@ -125,7 +125,7 @@ static int __hyp_text __guest_run(struct kvm_vcpu *vcpu)
fp_enabled = __fpsimd_enabled();
__sysreg_save_state(guest_ctxt);
__sysreg_save_guest_state(guest_ctxt);
__sysreg32_save_state(vcpu);
__timer_save_state(vcpu);
__vgic_save_state(vcpu);
@ -133,7 +133,7 @@ static int __hyp_text __guest_run(struct kvm_vcpu *vcpu)
__deactivate_traps(vcpu);
__deactivate_vm(vcpu);
__sysreg_restore_state(host_ctxt);
__sysreg_restore_host_state(host_ctxt);
if (fp_enabled) {
__fpsimd_save_state(&guest_ctxt->gp_regs.fp_regs);
@ -165,7 +165,7 @@ void __hyp_text __noreturn __hyp_panic(void)
host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context);
__deactivate_traps(vcpu);
__deactivate_vm(vcpu);
__sysreg_restore_state(host_ctxt);
__sysreg_restore_host_state(host_ctxt);
}
/* Call panic for real */

24
arch/arm64/kvm/hyp/sysreg-sr.c
View File

@ -24,7 +24,7 @@
#include "hyp.h"
/* ctxt is already in the HYP VA space */
void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
static void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
{
ctxt->sys_regs[MPIDR_EL1] = read_sysreg(vmpidr_el2);
ctxt->sys_regs[CSSELR_EL1] = read_sysreg(csselr_el1);
@ -57,7 +57,17 @@ void __hyp_text __sysreg_save_state(struct kvm_cpu_context *ctxt)
ctxt->gp_regs.spsr[KVM_SPSR_EL1]= read_sysreg(spsr_el1);
}
void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
void __hyp_text __sysreg_save_host_state(struct kvm_cpu_context *ctxt)
{
__sysreg_save_state(ctxt);
}
void __hyp_text __sysreg_save_guest_state(struct kvm_cpu_context *ctxt)
{
__sysreg_save_state(ctxt);
}
static void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
{
write_sysreg(ctxt->sys_regs[MPIDR_EL1], vmpidr_el2);
write_sysreg(ctxt->sys_regs[CSSELR_EL1], csselr_el1);
@ -90,6 +100,16 @@ void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
write_sysreg(ctxt->gp_regs.spsr[KVM_SPSR_EL1], spsr_el1);
}
void __hyp_text __sysreg_restore_host_state(struct kvm_cpu_context *ctxt)
{
__sysreg_restore_state(ctxt);
}
void __hyp_text __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt)
{
__sysreg_restore_state(ctxt);
}
void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
{
u64 *spsr, *sysreg;