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Optimize: the hardware does not clear the TLB flush command after a

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VMENTRY, so clear it ourselves, to avoid uselessly flushing the guest
TLB. While here also fix the processing of EFER-induced flushes, they
shouldn't be delayed.
This commit is contained in:
maxv 2019-02-12 14:54:59 +00:00
parent f911f1c1e1
commit c3f47f49f8
1 changed files with 10 additions and 11 deletions
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21
sys/dev/nvmm/x86/nvmm_x86_svm.c
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@ -1,4 +1,4 @@
/* $NetBSD: nvmm_x86_svm.c,v 1.19 2019/02/04 12:11:18 maxv Exp $ */
/* $NetBSD: nvmm_x86_svm.c,v 1.20 2019/02/12 14:54:59 maxv Exp $ */
/*
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_svm.c,v 1.19 2019/02/04 12:11:18 maxv Exp $");
__KERNEL_RCSID(0, "$NetBSD: nvmm_x86_svm.c,v 1.20 2019/02/12 14:54:59 maxv Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1194,12 +1194,6 @@ svm_vcpu_run(struct nvmm_machine *mach, struct nvmm_cpu *vcpu,
tlb_need_flush = true;
}
if (cpudata->tlb_want_flush || tlb_need_flush) {
vmcb->ctrl.tlb_ctrl = svm_ctrl_tlb_flush;
} else {
vmcb->ctrl.tlb_ctrl = 0;
}
if (vcpu->hcpu_last != hcpu) {
vmcb->ctrl.tsc_offset = cpudata->tsc_offset +
curcpu()->ci_data.cpu_cc_skew;
@ -1210,6 +1204,12 @@ svm_vcpu_run(struct nvmm_machine *mach, struct nvmm_cpu *vcpu,
svm_vcpu_guest_misc_enter(vcpu);
while (1) {
if (cpudata->tlb_want_flush || tlb_need_flush) {
vmcb->ctrl.tlb_ctrl = svm_ctrl_tlb_flush;
} else {
vmcb->ctrl.tlb_ctrl = 0;
}
s = splhigh();
svm_vcpu_guest_fpu_enter(vcpu);
svm_vmrun(cpudata->vmcb_pa, cpudata->gprs);
@ -1219,9 +1219,8 @@ svm_vcpu_run(struct nvmm_machine *mach, struct nvmm_cpu *vcpu,
svm_vmcb_cache_default(vmcb);
if (vmcb->ctrl.exitcode != VMCB_EXITCODE_INVALID) {
if (cpudata->tlb_want_flush) {
cpudata->tlb_want_flush = false;
}
cpudata->tlb_want_flush = false;
tlb_need_flush = false;
vcpu->hcpu_last = hcpu;
}