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From:   KarimAllah Ahmed <karahmed@amazon.de>
To:     x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     hpa@zytor.com, jmattson@google.com, mingo@redhat.com,
        pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de,
        KarimAllah Ahmed <karahmed@amazon.de>
Subject: [PATCH 10/10] KVM/X86: hyperv: Use kvm_vcpu_map in synic_deliver_msg
Date:   Wed, 21 Feb 2018 18:47:21 +0100
Message-Id: <1519235241-6500-11-git-send-email-karahmed@amazon.de>
In-Reply-To: <1519235241-6500-1-git-send-email-karahmed@amazon.de>
References: <1519235241-6500-1-git-send-email-karahmed@amazon.de>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

... since using kvm_vcpu_gpa_to_page() and kmap() will only work for guest
memory that has a "struct page".

Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
---
 arch/x86/kvm/hyperv.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 909b498..870fd24 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -559,7 +559,7 @@ static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
 			     struct hv_message *src_msg)
 {
 	struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
-	struct page *page;
+	struct kvm_host_map map;
 	gpa_t gpa;
 	struct hv_message *dst_msg;
 	int r;
@@ -569,11 +569,11 @@ static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
 		return -ENOENT;
 
 	gpa = synic->msg_page & PAGE_MASK;
-	page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
-	if (is_error_page(page))
+
+	if (!kvm_vcpu_map(vcpu, gpa_to_gfn(gpa), &map))
 		return -EFAULT;
 
-	msg_page = kmap_atomic(page);
+	msg_page = map.kaddr;
 	dst_msg = &msg_page->sint_message[sint];
 	if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
 			 src_msg->header.message_type) != HVMSG_NONE) {
@@ -590,8 +590,8 @@ static int synic_deliver_msg(struct kvm_vcpu_hv_synic *synic, u32 sint,
 		else if (r == 0)
 			r = -EFAULT;
 	}
-	kunmap_atomic(msg_page);
-	kvm_release_page_dirty(page);
+
+	kvm_vcpu_unmap(&map);
 	kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
 	return r;
 }
-- 
2.7.4