From 0967b7bf1c22b55777aba46ff616547feed0b141 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Sat, 15 Sep 2007 17:34:36 +0300 Subject: [PATCH] KVM: Skip pio instruction when it is emulated, not executed If we defer updating rip until pio instructions are executed, we have a problem with reset: a pio reset updates rip, and when the instruction completes we skip the emulated instruction, pointing rip somewhere completely unrelated. Fix by updating rip when we see decode the instruction, not after emulation. Signed-off-by: Avi Kivity --- drivers/kvm/kvm_main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 3b046507ebc6..353e58527d15 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1815,8 +1815,6 @@ static int complete_pio(struct kvm_vcpu *vcpu) io->count -= io->cur_count; io->cur_count = 0; - if (!io->count) - kvm_x86_ops->skip_emulated_instruction(vcpu); return 0; } @@ -1876,6 +1874,8 @@ int kvm_emulate_pio (struct kvm_vcpu *vcpu, struct kvm_run *run, int in, memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4); kvm_x86_ops->decache_regs(vcpu); + kvm_x86_ops->skip_emulated_instruction(vcpu); + pio_dev = vcpu_find_pio_dev(vcpu, port); if (pio_dev) { kernel_pio(pio_dev, vcpu, vcpu->pio_data); @@ -1938,6 +1938,9 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, vcpu->run->io.count = now; vcpu->pio.cur_count = now; + if (vcpu->pio.cur_count == vcpu->pio.count) + kvm_x86_ops->skip_emulated_instruction(vcpu); + for (i = 0; i < nr_pages; ++i) { mutex_lock(&vcpu->kvm->lock); page = gva_to_page(vcpu, address + i * PAGE_SIZE); -- 2.20.1