linux-kernel - [RFC 11/12] KVM/VMX: Use the new host mapping API for synic_deliver

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Date:   Mon,  5 Feb 2018 19:47:30 +0100
From:   KarimAllah Ahmed <karahmed@...zon.de>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     KarimAllah Ahmed <karahmed@...zon.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Subject: [RFC 11/12] KVM/VMX: Use the new host mapping API for synic_deliver_msg

Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: KarimAllah Ahmed <karahmed@...zon.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 408428a..be6ce0e 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -563,7 +563,7 @@ 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_mapping mapping;
 	gpa_t gpa;
 	struct hv_message *dst_msg;
 	int r;
@@ -573,11 +573,11 @@ 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_gpa_to_host_mapping(vcpu, gpa, &mapping, true))
 		return -EFAULT;
 
-	msg_page = kmap_atomic(page);
+	msg_page = mapping.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) {
@@ -594,8 +594,8 @@ 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_release_host_mapping(&mapping, true);
 	kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
 	return r;
 }
-- 
2.7.4