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KVM: arm64: Don't switch MMU on translation from non-NV context

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If calling into the AT code from guest EL1, there is no need
to consider any context switch, as we are guaranteed to be
in the correct context.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2025-08-25 11:24:11 +01:00
parent cb1762904c
commit 61b0280a67
1 changed files with 8 additions and 3 deletions
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11
arch/arm64/kvm/at.c
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@ -1285,7 +1285,7 @@ static u64 __kvm_at_s1e01_fast(struct kvm_vcpu *vcpu, u32 op, u64 vaddr)
{
struct mmu_config config;
struct kvm_s2_mmu *mmu;
bool fail;
bool fail, mmu_cs;
u64 par;
par = SYS_PAR_EL1_F;
@ -1301,8 +1301,13 @@ static u64 __kvm_at_s1e01_fast(struct kvm_vcpu *vcpu, u32 op, u64 vaddr)
* If HCR_EL2.{E2H,TGE} == {1,1}, the MMU context is already
* the right one (as we trapped from vEL2). If not, save the
* full MMU context.
*
* We are also guaranteed to be in the correct context if
* we're not in a nested VM.
*/
if (vcpu_el2_e2h_is_set(vcpu) && vcpu_el2_tge_is_set(vcpu))
mmu_cs = (vcpu_has_nv(vcpu) &&
!(vcpu_el2_e2h_is_set(vcpu) && vcpu_el2_tge_is_set(vcpu)));
if (!mmu_cs)
goto skip_mmu_switch;
/*
@ -1370,7 +1375,7 @@ skip_mmu_switch:
write_sysreg_hcr(HCR_HOST_VHE_FLAGS);
if (!(vcpu_el2_e2h_is_set(vcpu) && vcpu_el2_tge_is_set(vcpu)))
if (mmu_cs)
__mmu_config_restore(&config);
return par;