[PATCH v6 10/11] KVM: arm64: BTI: Reset BTYPE when skipping emulated instructions
From: Mark Brown <broonie@kernel.org>
Date: 2020-02-12 19:29:44
Also in:
linux-arch, linux-fsdevel, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
From: Dave Martin <Dave.Martin@arm.com> 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: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Mark Brown <broonie@kernel.org> --- arch/arm64/include/asm/kvm_emulate.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 688c63412cc2..dee51c1dcb93 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h@@ -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;
--
2.20.1
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