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KVM: arm64: Extend unified RESx handling to runtime sanitisation

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Add a new helper to retrieve the RESx values for a given system
register, and use it for the runtime sanitisation.

This results in slightly better code generation for a fairly hot
path in the hypervisor, and additionally covers all sanitised
registers in all conditions, not just the VNCR-based ones.

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-6-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier
2026-02-02 18:43:14 +00:00
parent 0879478913
commit f9d5895642
3 changed files with 20 additions and 18 deletions
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10
arch/arm64/kvm/emulate-nested.c
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@@ -2427,15 +2427,7 @@ static enum trap_behaviour compute_trap_behaviour(struct kvm_vcpu *vcpu,
static u64 kvm_get_sysreg_res0(struct kvm *kvm, enum vcpu_sysreg sr)
{
struct kvm_sysreg_masks *masks;
/* Only handle the VNCR-backed regs for now */
if (sr < __VNCR_START__)
return 0;
masks = kvm->arch.sysreg_masks;
return masks->mask[sr - __SANITISED_REG_START__].res0;
return kvm_get_sysreg_resx(kvm, sr).res0;
}
static bool check_fgt_bit(struct kvm_vcpu *vcpu, enum vcpu_sysreg sr,