kernel.git/drivers/kvm/kvm_main.c, branch linux-2.6.23.y

KVM: Skip pio instruction when it is emulated, not executed

2007-12-14T17:50:56Z

patch 0967b7bf1c22b55777aba46ff616547feed0b141 in mainline. 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 Signed-off-by: Greg Kroah-Hartman

KVM: SVM: Fix FPU leak while emulating clts

2007-12-14T17:50:56Z

patch 404fb881b82cf0cf6981832f8d31a7484e4dee81 in mainline. The clts code didn't use set_cr0 properly, so our lazy FPU processing wasn't being done by the clts instruction at all. (this isn't called on Intel as the hardware does the decode for us) Signed-off-by: Amit Shah Signed-off-by: Avi Kivity Signed-off-by: Greg Kroah-Hartman

KVM: Fix hang on uniprocessor

2007-12-14T17:50:56Z

This is not in mainline, as it was fixed differently in that tree. first_cpu(cpus) returns the only CPU when NR_CPUS is 1 regardless of the cpus mask. Therefore we avoid a kernel hang in KVM_SET_MEMORY_REGION ioctl on uniprocessor by not entering the loop at all. Signed-off-by: Marko Kohtala Signed-off-by: Avi Kivity Signed-off-by: Greg Kroah-Hartman

KVM: Avoid calling smp_call_function_single() with interrupts disabled

2007-08-19T17:13:49Z

When taking a cpu down, we need to hardware_disable() it. Unfortunately, the CPU_DYING notifier is called with interrupts disabled, which means we can't use smp_call_function_single(). Fortunately, the CPU_DYING notifier is always called on the dying cpu, so we don't need to use the function at all and can simply call hardware_disable() directly. Tested-by: Paolo Ornati Signed-off-by: Avi Kivity Signed-off-by: Linus Torvalds

KVM: Fix removal of nx capability from guest cpuid

2007-07-25T11:31:13Z

Testing the wrong bit caused kvm not to disable nx on the guest when it is disabled on the host (an mmu optimization relies on the nx bits being the same in the guest and host). This allows Windows to boot when nx is disabled on te host (e.g. when host pae is disabled). Signed-off-by: Avi Kivity

Revert "KVM: Avoid useless memory write when possible"

2007-07-25T11:30:56Z

This reverts commit a3c870bdce4d34332ebdba7eb9969592c4c6b243. While it does save useless updates, it (probably) defeats the fork detector, causing a massive performance loss. Signed-off-by: Avi Kivity

KVM: Fix unlikely kvm_create vs decache_vcpus_on_cpu race

2007-07-25T11:29:34Z

We add the kvm to the vm_list before initializing the vcpu mutexes, which can be mutex_trylock()'ed by decache_vcpus_on_cpu(). Signed-off-by: Rusty Russell Signed-off-by: Avi Kivity

KVM: Correctly handle writes crossing a page boundary

2007-07-25T11:29:17Z

Writes that are contiguous in virtual memory may not be contiguous in physical memory; so split writes that straddle a page boundary. Thanks to Aurelien for reporting the bug, patient testing, and a fix to this very patch. Signed-off-by: Aurelien Jarno Signed-off-by: Avi Kivity

KVM: x86 emulator: implement rdmsr and wrmsr

2007-07-20T17:16:29Z

Allow real-mode emulation of rdmsr and wrmsr. This allows smp Windows to boot, presumably for its sipi trampoline. Signed-off-by: Avi Kivity

KVM: Fix memory slot management functions for guest smp

2007-07-20T17:16:29Z

The memory slot management functions were oriented against vcpu 0, where they should be kvm-wide. This causes hangs starting X on guest smp. Fix by making the functions (and resultant tail in the mmu) non-vcpu-specific. Unfortunately this reduces the efficiency of the mmu object cache a bit. We may have to revisit this later. Signed-off-by: Avi Kivity