Commit 42e35f80 authored by KarimAllah Ahmed's avatar KarimAllah Ahmed Committed by Paolo Bonzini

KVM/X86: Use kvm_vcpu_map in emulator_cmpxchg_emulated

Use kvm_vcpu_map in emulator_cmpxchg_emulated since using
kvm_vcpu_gpa_to_page() and kmap() will only work for guest memory that has
a "struct page".
Signed-off-by: default avatarKarimAllah Ahmed <karahmed@amazon.de>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <kjonrad.wilk@oracle.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 3278e049
......@@ -5557,9 +5557,9 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
unsigned int bytes,
struct x86_exception *exception)
{
struct kvm_host_map map;
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
gpa_t gpa;
struct page *page;
char *kaddr;
bool exchanged;
......@@ -5576,12 +5576,11 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
goto emul_write;
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))
goto emul_write;
kaddr = kmap_atomic(page);
kaddr += offset_in_page(gpa);
kaddr = map.hva + offset_in_page(gpa);
switch (bytes) {
case 1:
exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
......@@ -5598,13 +5597,12 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
default:
BUG();
}
kunmap_atomic(kaddr);
kvm_release_page_dirty(page);
kvm_vcpu_unmap(vcpu, &map, true);
if (!exchanged)
return X86EMUL_CMPXCHG_FAILED;
kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
kvm_page_track_write(vcpu, gpa, new, bytes);
return X86EMUL_CONTINUE;
......
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