linux-kernel - [PATCH v3 11/13] KVM/X86: hyperv: Use kvm_vcpu_map in synic_deliver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1540074145-31285-12-git-send-email-karahmed@amazon.de>
Date:   Sun, 21 Oct 2018 00:22:23 +0200
From:   KarimAllah Ahmed <karahmed@...zon.de>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, rkrcmar@...hat.com
Cc:     KarimAllah Ahmed <karahmed@...zon.de>
Subject: [PATCH v3 11/13] KVM/X86: hyperv: Use kvm_vcpu_map in synic_deliver_msg

Use kvm_vcpu_map in synic_deliver_msg 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@...zon.de>
---
v1 -> v2:
- Update to match the new API return codes
---
 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 8bdc78d..5310b8b 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -581,7 +581,7 @@ 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;
@@ -591,11 +591,11 @@ 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.hva;
 	dst_msg = &msg_page->sint_message[sint];
 	if (sync_cmpxchg(&dst_msg->header.message_type, HVMSG_NONE,
 			 src_msg->header.message_type) != HVMSG_NONE) {
@@ -612,8 +612,8 @@ 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