linux-kernel - [PATCH 04/13] KVM: x86: Refactor R/W page helper to take the emulation context

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Message-Id: <20191122223959.13545-5-sean.j.christopherson@intel.com>
Date:   Fri, 22 Nov 2019 14:39:50 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 04/13] KVM: x86: Refactor R/W page helper to take the emulation context

Invert the vcpu->context derivation in emulator_read_write_onepage() in
preparation for dynamically allocating the emulation context.

Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/kvm/x86.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c3992ed1568a..a0e87f13af82 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5648,14 +5648,14 @@ static const struct read_write_emulator_ops write_emultor = {
 static int emulator_read_write_onepage(unsigned long addr, void *val,
 				       unsigned int bytes,
 				       struct x86_exception *exception,
-				       struct kvm_vcpu *vcpu,
+				       struct x86_emulate_ctxt *ctxt,
 				       const struct read_write_emulator_ops *ops)
 {
 	gpa_t gpa;
 	int handled, ret;
 	bool write = ops->write;
 	struct kvm_mmio_fragment *frag;
-	struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
+	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
 
 	/*
 	 * If the exit was due to a NPF we may already have a GPA.
@@ -5719,7 +5719,7 @@ static int emulator_read_write(struct x86_emulate_ctxt *ctxt,
 
 		now = -addr & ~PAGE_MASK;
 		rc = emulator_read_write_onepage(addr, val, now, exception,
-						 vcpu, ops);
+						 ctxt, ops);
 
 		if (rc != X86EMUL_CONTINUE)
 			return rc;
@@ -5731,7 +5731,7 @@ static int emulator_read_write(struct x86_emulate_ctxt *ctxt,
 	}
 
 	rc = emulator_read_write_onepage(addr, val, bytes, exception,
-					 vcpu, ops);
+					 ctxt, ops);
 	if (rc != X86EMUL_CONTINUE)
 		return rc;
 
-- 
2.24.0