diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2018-11-09 15:07:10 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-20 10:09:00 +0100 |
| commit | 39e6fd28a1bf177eb2f7031388ad82c6d6077bfb (patch) | |
| tree | 9178ae651c75ffa465db1ad46fe86bc9183a636f /arch | |
| parent | a6e15ccc870a628c0a494f5aeed3e3048748905d (diff) | |
arm64: KVM: Skip MMIO insn after emulation
[ Upstream commit 0d640732dbebed0f10f18526de21652931f0b2f2 ]
When we emulate an MMIO instruction, we advance the CPU state within
decode_hsr(), before emulating the instruction effects.
Having this logic in decode_hsr() is opaque, and advancing the state
before emulation is problematic. It gets in the way of applying
consistent single-step logic, and it prevents us from being able to fail
an MMIO instruction with a synchronous exception.
Clean this up by only advancing the CPU state *after* the effects of the
instruction are emulated.
Cc: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/kvm/mmio.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/arm/kvm/mmio.c b/arch/arm/kvm/mmio.c index 4cb5a93182e9..c215bb4423ac 100644 --- a/arch/arm/kvm/mmio.c +++ b/arch/arm/kvm/mmio.c @@ -118,6 +118,12 @@ int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run) *vcpu_reg(vcpu, vcpu->arch.mmio_decode.rt) = data; } + /* + * The MMIO instruction is emulated and should not be re-executed + * in the guest. + */ + kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); + return 0; } @@ -154,11 +160,6 @@ static int decode_hsr(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, vcpu->arch.mmio_decode.sign_extend = sign_extend; vcpu->arch.mmio_decode.rt = rt; - /* - * The MMIO instruction is emulated and should not be re-executed - * in the guest. - */ - kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); return 0; } |