mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-14 06:30:20 -04:00
Code Issues Packages Projects Releases Wiki Activity

KVM: arm64: Make TLBI OS/Range UNDEF if not advertised to the guest

Browse Source 
Outer Shareable and Range TLBI instructions shouldn't be made available
to the guest if they are not advertised. Use FGU to disable those,
and set HCR_EL2.TLBIOS in the case the host doesn't have FGT. Note
that in that later case, we cannot efficiently disable TLBI Range
instructions, as this would require to trap all TLBIs.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20240214131827.2856277-22-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier
2024-02-14 13:18:22 +00:00
committed by Oliver Upton
parent d196c20c6e
commit 8ecdccb9e5
1 changed files with 34 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
arch/arm64/kvm/sys_regs.c
View File

@@ -3948,6 +3948,14 @@ void kvm_init_sysreg(struct kvm_vcpu *vcpu)
mutex_lock(&kvm->arch.config_lock);
/*
* In the absence of FGT, we cannot independently trap TLBI
* Range instructions. This isn't great, but trapping all
* TLBIs would be far worse. Live with it...
*/
if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, OS))
vcpu->arch.hcr_el2 |= HCR_TTLBOS;
if (test_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags))
goto out;
@@ -3960,6 +3968,32 @@ void kvm_init_sysreg(struct kvm_vcpu *vcpu)
HFGxTR_EL2_nSMPRI_EL1_MASK |
HFGxTR_EL2_nTPIDR2_EL0_MASK);
if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, OS))
kvm->arch.fgu[HFGITR_GROUP] |= (HFGITR_EL2_TLBIRVAALE1OS|
HFGITR_EL2_TLBIRVALE1OS |
HFGITR_EL2_TLBIRVAAE1OS |
HFGITR_EL2_TLBIRVAE1OS |
HFGITR_EL2_TLBIVAALE1OS |
HFGITR_EL2_TLBIVALE1OS |
HFGITR_EL2_TLBIVAAE1OS |
HFGITR_EL2_TLBIASIDE1OS |
HFGITR_EL2_TLBIVAE1OS |
HFGITR_EL2_TLBIVMALLE1OS);
if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, RANGE))
kvm->arch.fgu[HFGITR_GROUP] |= (HFGITR_EL2_TLBIRVAALE1 |
HFGITR_EL2_TLBIRVALE1 |
HFGITR_EL2_TLBIRVAAE1 |
HFGITR_EL2_TLBIRVAE1 |
HFGITR_EL2_TLBIRVAALE1IS|
HFGITR_EL2_TLBIRVALE1IS |
HFGITR_EL2_TLBIRVAAE1IS |
HFGITR_EL2_TLBIRVAE1IS |
HFGITR_EL2_TLBIRVAALE1OS|
HFGITR_EL2_TLBIRVALE1OS |
HFGITR_EL2_TLBIRVAAE1OS |
HFGITR_EL2_TLBIRVAE1OS);
set_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags);
out:
mutex_unlock(&kvm->arch.config_lock);