From: Hou Wenlong <houwenlong93@linux.alibaba.com>
To: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)),
"H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT
AND 64-BIT))
Subject: [PATCH v2 2/3] kvm: x86: Refactor kvm_emulate_hypercall() to no skip instruction
Date: Thu, 9 Sep 2021 19:55:24 +0800 [thread overview]
Message-ID: <87b4d982f134b83132867cfcf840f8b0cdb454be.1631188011.git.houwenlong93@linux.alibaba.com> (raw)
In-Reply-To: <cover.1631188011.git.houwenlong93@linux.alibaba.com>
Refactor kvm_emulate_hypercall() to no skip instruction, it can
be used in next patch for emulating hypercall in instruction
emulation.
Signed-off-by: Hou Wenlong <houwenlong93@linux.alibaba.com>
---
arch/x86/kvm/x86.c | 36 +++++++++++++++++++++++-------------
1 file changed, 23 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4e2836b94a01..b8d799e1c57c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8636,17 +8636,11 @@ static int complete_hypercall_exit(struct kvm_vcpu *vcpu)
return kvm_skip_emulated_instruction(vcpu);
}
-int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
+static int kvm_emulate_hypercall_noskip(struct kvm_vcpu *vcpu)
{
unsigned long nr, a0, a1, a2, a3, ret;
int op_64_bit;
- if (kvm_xen_hypercall_enabled(vcpu->kvm))
- return kvm_xen_hypercall(vcpu);
-
- if (kvm_hv_hypercall_enabled(vcpu))
- return kvm_hv_hypercall(vcpu);
-
nr = kvm_rax_read(vcpu);
a0 = kvm_rbx_read(vcpu);
a1 = kvm_rcx_read(vcpu);
@@ -8664,11 +8658,6 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
a3 &= 0xFFFFFFFF;
}
- if (static_call(kvm_x86_get_cpl)(vcpu) != 0) {
- static_call(kvm_x86_handle_hypercall_fail)(vcpu);
- return 1;
- }
-
ret = -KVM_ENOSYS;
switch (nr) {
@@ -8733,7 +8722,28 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
kvm_rax_write(vcpu, ret);
++vcpu->stat.hypercalls;
- return kvm_skip_emulated_instruction(vcpu);
+ return 1;
+}
+
+int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
+{
+ int ret;
+
+ if (kvm_xen_hypercall_enabled(vcpu->kvm))
+ return kvm_xen_hypercall(vcpu);
+
+ if (kvm_hv_hypercall_enabled(vcpu))
+ return kvm_hv_hypercall(vcpu);
+
+ if (static_call(kvm_x86_get_cpl)(vcpu) != 0) {
+ static_call(kvm_x86_handle_hypercall_fail)(vcpu);
+ return 1;
+ }
+
+ ret = kvm_emulate_hypercall_noskip(vcpu);
+ if (ret)
+ return kvm_skip_emulated_instruction(vcpu);
+ return ret;
}
EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
--
2.31.1
next prev parent reply other threads:[~2021-09-09 12:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1631188011.git.houwenlong93@linux.alibaba.com>
2021-09-09 11:55 ` [PATCH v2 1/3] kvm: x86: Introduce hypercall x86 ops for handling hypercall not in cpl0 Hou Wenlong
2021-09-09 16:39 ` Yu Zhang
2021-09-09 17:09 ` Sean Christopherson
2021-09-10 1:53 ` Yu Zhang
2021-09-09 11:55 ` Hou Wenlong [this message]
2021-09-09 11:55 ` [PATCH v2 3/3] kvm: x86: Emulate hypercall instead of fixing hypercall instruction Hou Wenlong
2021-09-16 16:00 ` Sean Christopherson
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