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| author | Marc Zyngier <maz@kernel.org> | 2026-05-11 13:46:11 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2026-05-21 09:42:19 +0300 |
| commit | 27ae400e6e888153ded1ad807a94a94e506dd2df (patch) | |
| tree | 3218d2e4e8524c66ae59dbbaa5a8420c87cf80e0 | |
| parent | 5d6919055dec134de3c40167a490f33c74c12581 (diff) | |
| download | linux-27ae400e6e888153ded1ad807a94a94e506dd2df.tar.xz | |
KVM: arm64: nv: Track L2 to L1 exception emulation
While we currently track that we are emulating a nested ERET from
L1 to L2, we currently don't track the reverse direction (an exception
going from L2 to L1).
Add a new vcpu state flag for this purpose, which will see some
use shortly.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://patch.msgid.link/20260520085036.541666-2-maz@kernel.org
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 3 | ||||
| -rw-r--r-- | arch/arm64/kvm/emulate-nested.c | 4 |
2 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 65eead8362e0..c79747d5f4dd 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -1112,7 +1112,8 @@ struct kvm_vcpu_arch { #define IN_NESTED_ERET __vcpu_single_flag(sflags, BIT(7)) /* SError pending for nested guest */ #define NESTED_SERROR_PENDING __vcpu_single_flag(sflags, BIT(8)) - +/* KVM is currently emulating an L2 to L1 exception */ +#define IN_NESTED_EXCEPTION __vcpu_single_flag(sflags, BIT(9)) /* Pointer to the vcpu's SVE FFR for sve_{save,load}_state() */ #define vcpu_sve_pffr(vcpu) (kern_hyp_va((vcpu)->arch.sve_state) + \ diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c index dba7ced74ca5..15c691a6266d 100644 --- a/arch/arm64/kvm/emulate-nested.c +++ b/arch/arm64/kvm/emulate-nested.c @@ -2862,6 +2862,8 @@ static int kvm_inject_nested(struct kvm_vcpu *vcpu, u64 esr_el2, preempt_disable(); + vcpu_set_flag(vcpu, IN_NESTED_EXCEPTION); + /* * We may have an exception or PC update in the EL0/EL1 context. * Commit it before entering EL2. @@ -2884,6 +2886,8 @@ static int kvm_inject_nested(struct kvm_vcpu *vcpu, u64 esr_el2, __kvm_adjust_pc(vcpu); kvm_arch_vcpu_load(vcpu, smp_processor_id()); + vcpu_clear_flag(vcpu, IN_NESTED_EXCEPTION); + preempt_enable(); if (kvm_vcpu_has_pmu(vcpu)) |