All of lore.kernel.org
 help / color / mirror / Atom feed
From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Paolo Bonzini <pbonzini@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: [PATCH 2/7] KVM: x86: Read guest RIP from within the kvm_nested_vmexit tracepoint
Date: Fri, 17 Jul 2020 23:38:49 -0700	[thread overview]
Message-ID: <20200718063854.16017-3-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20200718063854.16017-1-sean.j.christopherson@intel.com>

Use kvm_rip_read() to read the guest's RIP for the nested VM-Exit
tracepoint instead of having the caller pass in the tracepoint.  Params
that are passed into a tracepoint are evaluated even if the tracepoint
is disabled, i.e. passing in RIP for VMX incurs a VMREAD and retpoline
to retrieve a value that may never be used, e.g. if the exit is due to a
hardware interrupt.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kvm/svm/svm.c    | 2 +-
 arch/x86/kvm/trace.h      | 6 +++---
 arch/x86/kvm/vmx/nested.c | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 783330d0e7b88..1fea39ff33077 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2943,7 +2943,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
 	if (is_guest_mode(vcpu)) {
 		int vmexit;
 
-		trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
+		trace_kvm_nested_vmexit(vcpu, exit_code,
 					svm->vmcb->control.exit_info_1,
 					svm->vmcb->control.exit_info_2,
 					svm->vmcb->control.exit_int_info,
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 9899ff0fa2534..00e567378ae1f 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -571,10 +571,10 @@ TRACE_EVENT(kvm_nested_intercepts,
  * Tracepoint for #VMEXIT while nested
  */
 TRACE_EVENT(kvm_nested_vmexit,
-	    TP_PROTO(__u64 rip, __u32 exit_code,
+	    TP_PROTO(struct kvm_vcpu *vcpu, __u32 exit_code,
 		     __u64 exit_info1, __u64 exit_info2,
 		     __u32 exit_int_info, __u32 exit_int_info_err, __u32 isa),
-	    TP_ARGS(rip, exit_code, exit_info1, exit_info2,
+	    TP_ARGS(vcpu, exit_code, exit_info1, exit_info2,
 		    exit_int_info, exit_int_info_err, isa),
 
 	TP_STRUCT__entry(
@@ -588,7 +588,7 @@ TRACE_EVENT(kvm_nested_vmexit,
 	),
 
 	TP_fast_assign(
-		__entry->rip			= rip;
+		__entry->rip			= kvm_rip_read(vcpu);
 		__entry->exit_code		= exit_code;
 		__entry->exit_info1		= exit_info1;
 		__entry->exit_info2		= exit_info2;
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 4d561edf6f9ca..6f81097cbc794 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -5912,7 +5912,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu)
 	exit_intr_info = vmx_get_intr_info(vcpu);
 	exit_qual = vmx_get_exit_qual(vcpu);
 
-	trace_kvm_nested_vmexit(kvm_rip_read(vcpu), exit_reason, exit_qual,
+	trace_kvm_nested_vmexit(vcpu, exit_reason, exit_qual,
 				vmx->idt_vectoring_info, exit_intr_info,
 				vmcs_read32(VM_EXIT_INTR_ERROR_CODE),
 				KVM_ISA_VMX);
-- 
2.26.0


  parent reply	other threads:[~2020-07-18  6:39 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-18  6:38 [PATCH 0/7] KVM: x86: Tracepoint improvements and fixes Sean Christopherson
2020-07-18  6:38 ` [PATCH 1/7] KVM: x86: Add RIP to the kvm_entry, i.e. VM-Enter, tracepoint Sean Christopherson
2020-07-18  6:38 ` Sean Christopherson [this message]
2020-07-18  6:38 ` [PATCH 3/7] KVM: VMX: Add a helper to test for a valid error code given an intr info Sean Christopherson
2020-07-18  6:38 ` [PATCH 4/7] KVM: x86: Add intr/vectoring info and error code to kvm_exit tracepoint Sean Christopherson
2020-07-18  6:38 ` [PATCH 5/7] KVM: x86: Add macro wrapper for defining " Sean Christopherson
2020-07-18  6:38 ` [PATCH 6/7] KVM: x86: Use common definition for kvm_nested_vmexit tracepoint Sean Christopherson
2020-07-20 16:52   ` Vitaly Kuznetsov
2020-07-21  0:27     ` Sean Christopherson
2020-07-21 13:59       ` Vitaly Kuznetsov
2020-07-21 19:31         ` Sean Christopherson
2020-07-21 21:42           ` Steven Rostedt
2020-08-12 18:10         ` Sean Christopherson
2020-07-18  6:38 ` [PATCH 7/7] KVM: nVMX: Read EXIT_QUAL and INTR_INFO only when needed for nested 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=20200718063854.16017-3-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=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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.