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KVM: ia64: fix zero extending for mmio ld1/2/4 emulation in KVM 

Only copy in the data actually requested by the instruction emulation
and zero pad the destination register first. This avoids the problem
where emulated mmio access got garbled data from ld2.acq instructions
in the vga console driver.

Signed-off-by: Jes Sorensen <jes@sgi.com>
Acked-by: Xiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Jes Sorensen 2008-05-20 13:13:50 +02:00 committed by Avi Kivity
parent 39b945a37b
commit f20d275298
1 changed files with 2 additions and 1 deletions
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3
arch/ia64/kvm/mmio.c
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@ -159,7 +159,8 @@ static void mmio_access(struct kvm_vcpu *vcpu, u64 src_pa, u64 *dest,
if (p->u.ioreq.state == STATE_IORESP_READY) {
if (dir == IOREQ_READ)
*dest = p->u.ioreq.data;
/* it's necessary to ensure zero extending */
*dest = p->u.ioreq.data & (~0UL >> (64-(s*8)));
} else
panic_vm(vcpu);
out: