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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>
This commit is contained in:
Radim Krčmář 2015-10-30 16:36:25 +01:00 committed by Paolo Bonzini
parent 7a036a6f67
commit f40606b147
1 changed files with 3 additions and 4 deletions
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7
arch/x86/kvm/emulate.c
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@ -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.
*/