From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
Alexander Graf <graf@amazon.com>,
Tom Lendacky <thomas.lendacky@amd.com>
Subject: [PATCH 2/3] KVM: x86: use kvm_complete_insn_gp in emulating RDMSR/WRMSR
Date: Mon, 14 Dec 2020 13:32:49 -0500 [thread overview]
Message-ID: <20201214183250.1034541-3-pbonzini@redhat.com> (raw)
In-Reply-To: <20201214183250.1034541-1-pbonzini@redhat.com>
Simplify the four functions that handle {kernel,user} {rd,wr}msr, there
is still some repetition between the two instances of rdmsr but the
whole business of calling kvm_inject_gp and kvm_skip_emulated_instruction
can be unified nicely.
Because complete_emulated_wrmsr now becomes essentially a call to
kvm_complete_insn_gp, remove complete_emulated_msr.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/x86.c | 42 ++++++++++++++++--------------------------
1 file changed, 16 insertions(+), 26 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a3fdc16cfd6f..2f1bc52e70c0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1634,27 +1634,20 @@ int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data)
}
EXPORT_SYMBOL_GPL(kvm_set_msr);
-static int complete_emulated_msr(struct kvm_vcpu *vcpu, bool is_read)
+static int complete_emulated_rdmsr(struct kvm_vcpu *vcpu)
{
- if (vcpu->run->msr.error) {
- kvm_inject_gp(vcpu, 0);
- return 1;
- } else if (is_read) {
+ int err = vcpu->run->msr.error;
+ if (!err) {
kvm_rax_write(vcpu, (u32)vcpu->run->msr.data);
kvm_rdx_write(vcpu, vcpu->run->msr.data >> 32);
}
- return kvm_skip_emulated_instruction(vcpu);
-}
-
-static int complete_emulated_rdmsr(struct kvm_vcpu *vcpu)
-{
- return complete_emulated_msr(vcpu, true);
+ return kvm_complete_insn_gp(vcpu, err);
}
static int complete_emulated_wrmsr(struct kvm_vcpu *vcpu)
{
- return complete_emulated_msr(vcpu, false);
+ return kvm_complete_insn_gp(vcpu, vcpu->run->msr.error);
}
static u64 kvm_msr_reason(int r)
@@ -1718,17 +1711,16 @@ int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu)
}
/* MSR read failed? Inject a #GP */
- if (r) {
+ if (!r) {
+ trace_kvm_msr_read(ecx, data);
+
+ kvm_rax_write(vcpu, data & -1u);
+ kvm_rdx_write(vcpu, (data >> 32) & -1u);
+ } else {
trace_kvm_msr_read_ex(ecx);
- kvm_inject_gp(vcpu, 0);
- return 1;
}
- trace_kvm_msr_read(ecx, data);
-
- kvm_rax_write(vcpu, data & -1u);
- kvm_rdx_write(vcpu, (data >> 32) & -1u);
- return kvm_skip_emulated_instruction(vcpu);
+ return kvm_complete_insn_gp(vcpu, r);
}
EXPORT_SYMBOL_GPL(kvm_emulate_rdmsr);
@@ -1750,14 +1742,12 @@ int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
return r;
/* MSR write failed? Inject a #GP */
- if (r > 0) {
+ if (!r)
+ trace_kvm_msr_write(ecx, data);
+ else
trace_kvm_msr_write_ex(ecx, data);
- kvm_inject_gp(vcpu, 0);
- return 1;
- }
- trace_kvm_msr_write(ecx, data);
- return kvm_skip_emulated_instruction(vcpu);
+ return kvm_complete_insn_gp(vcpu, r);
}
EXPORT_SYMBOL_GPL(kvm_emulate_wrmsr);
--
2.26.2
next prev parent reply other threads:[~2020-12-14 18:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 18:32 [PATCH 0/3] KVM: x86: MSR completion refactoring for SEV-ES Paolo Bonzini
2020-12-14 18:32 ` [PATCH 1/3] KVM: x86: remove bogus #GP injection Paolo Bonzini
2020-12-14 20:50 ` Tom Lendacky
2020-12-14 18:32 ` Paolo Bonzini [this message]
2020-12-14 20:52 ` [PATCH 2/3] KVM: x86: use kvm_complete_insn_gp in emulating RDMSR/WRMSR Tom Lendacky
2020-12-14 18:32 ` [PATCH 3/3] KVM: x86: introduce complete_emulated_msr callback Paolo Bonzini
2020-12-14 20:55 ` Tom Lendacky
2020-12-15 10:23 ` Paolo Bonzini
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