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18863bdd60
The various syscall-related MSRs are fairly expensive to switch. Currently we switch them on every vcpu preemption, which is far too often: - if we're switching to a kernel thread (idle task, threaded interrupt, kernel-mode virtio server (vhost-net), for example) and back, then there's no need to switch those MSRs since kernel threasd won't be exiting to userspace. - if we're switching to another guest running an identical OS, most likely those MSRs will have the same value, so there's little point in reloading them. - if we're running the same OS on the guest and host, the MSRs will have identical values and reloading is unnecessary. This patch uses the new user return notifiers to implement last-minute switching, and checks the msr values to avoid unnecessary reloading. Signed-off-by: Avi Kivity <avi@redhat.com> |
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| .. | ||
| emulate.c | ||
| i8254.c | ||
| i8254.h | ||
| i8259.c | ||
| irq.c | ||
| irq.h | ||
| Kconfig | ||
| kvm_cache_regs.h | ||
| kvm_timer.h | ||
| lapic.c | ||
| lapic.h | ||
| Makefile | ||
| mmu.c | ||
| mmu.h | ||
| mmutrace.h | ||
| paging_tmpl.h | ||
| svm.c | ||
| timer.c | ||
| trace.h | ||
| tss.h | ||
| vmx.c | ||
| x86.c | ||
| x86.h | ||