Commit f20d2752 authored May 20, 2008 by Jes Sorensen Committed by Avi Kivity Jun 06, 2008

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>

parent 39b945a3

arch/ia64/kvm/mmio.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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-(s8)));
		} else
		panic_vm(vcpu);
		out: