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KVM: arm64: BTI: Reset BTYPE when skipping emulated instructions

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Since normal execution of any non-branch instruction resets the
PSTATE BTYPE field to 0, so do the same thing when emulating a
trapped instruction.

Branches don't trap directly, so we should never need to assign a
non-zero value to BTYPE here.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Dave Martin 2020-03-16 16:50:52 +00:00 committed by Catalin Marinas
parent 0537c4cd71
commit 30685d789c
1 changed files with 4 additions and 2 deletions
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6
arch/arm64/include/asm/kvm_emulate.h
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@ -506,10 +506,12 @@ static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
{
if (vcpu_mode_is_32bit(vcpu))
if (vcpu_mode_is_32bit(vcpu)) {
kvm_skip_instr32(vcpu, is_wide_instr);
else
} else {
*vcpu_pc(vcpu) += 4;
*vcpu_cpsr(vcpu) &= ~PSR_BTYPE_MASK;
}
/* advance the singlestep state machine */
*vcpu_cpsr(vcpu) &= ~DBG_SPSR_SS;