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| author | Radim Krčmář <rkrcmar@redhat.com> | 2015-10-30 16:36:25 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-11-04 16:24:32 +0100 |
| commit | f40606b147dd5b4678cedc877a71deb520ca507e (patch) | |
| tree | a862d51db7a097195e82da280b3dda77b3fb265e /arch/x86/kvm/emulate.c | |
| parent | 7a036a6f670f63b32c5ee126425f9109271ca13f (diff) | |
| download | lwn-f40606b147dd5b4678cedc877a71deb520ca507e.tar.gz lwn-f40606b147dd5b4678cedc877a71deb520ca507e.zip | |
KVM: x86: handle SMBASE as physical address in RSM
GET_SMSTATE depends on real mode to ensure that smbase+offset is treated
as a physical address, which has already caused a bug after shuffling
the code. Enforce physical addressing.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reported-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/emulate.c')
| -rw-r--r-- | arch/x86/kvm/emulate.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 9da95b9daf8d..b60fed56671b 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -2272,8 +2272,8 @@ static int emulator_has_longmode(struct x86_emulate_ctxt *ctxt) #define GET_SMSTATE(type, smbase, offset) \ ({ \ type __val; \ - int r = ctxt->ops->read_std(ctxt, smbase + offset, &__val, \ - sizeof(__val), NULL); \ + int r = ctxt->ops->read_phys(ctxt, smbase + offset, &__val, \ + sizeof(__val)); \ if (r != X86EMUL_CONTINUE) \ return X86EMUL_UNHANDLEABLE; \ __val; \ @@ -2484,8 +2484,7 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt) /* * Get back to real mode, to prepare a safe state in which to load - * CR0/CR3/CR4/EFER. Also this will ensure that addresses passed - * to read_std/write_std are not virtual. + * CR0/CR3/CR4/EFER. * * CR4.PCIDE must be zero, because it is a 64-bit mode only feature. */ |