KVM: x86: Emulation of MOV-sreg to memory uses incorrect size

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In x86, you can only MOV-sreg to memory with either 16-bits or 64-bits size.
In contrast, KVM may write to 32-bits memory on MOV-sreg. This patch fixes KVM
behavior, and sets the destination operand size to two, if the destination is
memory.

When destination is registers, and the operand size is 32-bits, the high
16-bits in modern CPUs is filled with zero.  This is handled correctly.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Nadav Amit 2014-11-02 11:54:46 +02:00 • committed by Paolo Bonzini

parent 82b32774c2

commit b5bbf10ee6

1 changed files with 2 additions and 0 deletions

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arch/x86/kvm/emulate.c

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