linux-kernel - [PATCH] KVM: VMX: Fix and tweak the comments for VM-Enter

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Date:   Thu, 15 Aug 2019 13:09:31 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: VMX: Fix and tweak the comments for VM-Enter

Fix an incorrect/stale comment regarding the vmx_vcpu pointer, as guest
registers are now loaded using a direct pointer to the start of the
register array.

Opportunistically add a comment to document why the vmx_vcpu pointer is
needed, its consumption via 'call vmx_update_host_rsp' is rather subtle.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/vmx/vmenter.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmenter.S b/arch/x86/kvm/vmx/vmenter.S
index 4010d519eb8c..751a384c2eb0 100644
--- a/arch/x86/kvm/vmx/vmenter.S
+++ b/arch/x86/kvm/vmx/vmenter.S
@@ -94,7 +94,7 @@ ENDPROC(vmx_vmexit)
 
 /**
  * __vmx_vcpu_run - Run a vCPU via a transition to VMX guest mode
- * @vmx:	struct vcpu_vmx *
+ * @vmx:	struct vcpu_vmx * (forwarded to vmx_update_host_rsp)
  * @regs:	unsigned long * (to guest registers)
  * @launched:	%true if the VMCS has been launched
  *
@@ -151,7 +151,7 @@ ENTRY(__vmx_vcpu_run)
 	mov VCPU_R14(%_ASM_AX), %r14
 	mov VCPU_R15(%_ASM_AX), %r15
 #endif
-	/* Load guest RAX.  This kills the vmx_vcpu pointer! */
+	/* Load guest RAX.  This kills the @regs pointer! */
 	mov VCPU_RAX(%_ASM_AX), %_ASM_AX
 
 	/* Enter guest mode */
-- 
2.22.0