From: Sean Christopherson <sean.j.christopherson@intel.com>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RESEND PATCH 05/13] KVM: x86: Don't attempt VMWare emulation on #GP with non-zero error code
Date: Thu, 22 Aug 2019 18:07:01 -0700 [thread overview]
Message-ID: <20190823010709.24879-6-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20190823010709.24879-1-sean.j.christopherson@intel.com>
The VMware backdoor hooks #GP faults on IN{S}, OUT{S}, and RDPMC, none
of which generate a non-zero error code for their #GP. Re-injecting #GP
instead of attempting emulation on a non-zero error code will allow a
future patch to move #GP injection (for emulation failure) into
kvm_emulate_instruction() without having to plumb in the error code.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/svm.c | 6 +++++-
arch/x86/kvm/vmx/vmx.c | 7 ++++++-
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 5a42f9c70014..b96a119690f4 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2772,11 +2772,15 @@ static int gp_interception(struct vcpu_svm *svm)
WARN_ON_ONCE(!enable_vmware_backdoor);
+ if (error_code) {
+ kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
+ return 1;
+ }
er = kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE);
if (er == EMULATE_USER_EXIT)
return 0;
else if (er != EMULATE_DONE)
- kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
+ kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
return 1;
}
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 6ecf773825e2..3ee0dd304bc7 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4509,11 +4509,16 @@ static int handle_exception_nmi(struct kvm_vcpu *vcpu)
if (!vmx->rmode.vm86_active && is_gp_fault(intr_info)) {
WARN_ON_ONCE(!enable_vmware_backdoor);
+
+ if (error_code) {
+ kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
+ return 1;
+ }
er = kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE);
if (er == EMULATE_USER_EXIT)
return 0;
else if (er != EMULATE_DONE)
- kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
+ kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
return 1;
}
--
2.22.0
next prev parent reply other threads:[~2019-08-23 1:08 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-23 1:06 [RESEND PATCH 00/13] KVM: x86: Remove emulation_result enums Sean Christopherson
2019-08-23 1:06 ` [RESEND PATCH 01/13] KVM: x86: Relocate MMIO exit stats counting Sean Christopherson
2019-08-23 9:15 ` Vitaly Kuznetsov
2019-08-23 14:37 ` Sean Christopherson
2019-08-23 1:06 ` [RESEND PATCH 02/13] KVM: x86: Clean up handle_emulation_failure() Sean Christopherson
2019-08-23 9:23 ` Vitaly Kuznetsov
2019-08-23 12:58 ` Liran Alon
2019-08-23 1:06 ` [RESEND PATCH 03/13] KVM: x86: Refactor kvm_vcpu_do_singlestep() to remove out param Sean Christopherson
2019-08-23 9:32 ` Vitaly Kuznetsov
2019-08-23 13:05 ` Liran Alon
2019-08-23 1:07 ` [RESEND PATCH 04/13] KVM: x86: Drop EMULTYPE_NO_UD_ON_FAIL as a standalone type Sean Christopherson
2019-08-23 9:34 ` Vitaly Kuznetsov
2019-08-23 13:21 ` Liran Alon
2019-08-23 13:32 ` Liran Alon
2019-08-23 21:55 ` Sean Christopherson
2019-08-23 1:07 ` Sean Christopherson [this message]
2019-08-23 11:51 ` [RESEND PATCH 05/13] KVM: x86: Don't attempt VMWare emulation on #GP with non-zero error code Vitaly Kuznetsov
2019-08-23 13:23 ` Liran Alon
2019-08-23 1:07 ` [RESEND PATCH 06/13] KVM: x86: Move #GP injection for VMware into x86_emulate_instruction() Sean Christopherson
2019-08-23 12:27 ` Vitaly Kuznetsov
2019-08-23 13:30 ` Liran Alon
2019-08-23 1:07 ` [RESEND PATCH 07/13] KVM: x86: Add explicit flag for forced emulation on #UD Sean Christopherson
2019-08-23 13:47 ` Liran Alon
2019-08-23 14:44 ` Sean Christopherson
2019-08-23 15:31 ` Liran Alon
2019-08-23 1:07 ` [RESEND PATCH 08/13] KVM: x86: Move #UD injection for failed emulation into emulation code Sean Christopherson
2019-08-23 13:48 ` Liran Alon
2019-08-27 20:22 ` Sean Christopherson
2019-08-23 1:07 ` [RESEND PATCH 09/13] KVM: x86: Exit to userspace on emulation skip failure Sean Christopherson
2019-08-23 1:07 ` [RESEND PATCH 10/13] KVM: x86: Handle emulation failure directly in kvm_task_switch() Sean Christopherson
2019-08-23 1:07 ` [RESEND PATCH 11/13] KVM: x86: Move triple fault request into RM int injection Sean Christopherson
2019-08-23 1:07 ` [RESEND PATCH 12/13] KVM: VMX: Remove EMULATE_FAIL handling in handle_invalid_guest_state() Sean Christopherson
2019-08-23 1:07 ` [RESEND PATCH 13/13] KVM: x86: Remove emulation_result enums, EMULATE_{DONE,FAIL,USER_EXIT} Sean Christopherson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190823010709.24879-6-sean.j.christopherson@intel.com \
--to=sean.j.christopherson@intel.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pbonzini@redhat.com \
--cc=rkrcmar@redhat.com \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).