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44bfe1f049
Make svm_x86_ops globally visible in anticipation of modifying the struct in avic.c, and clean up the KVM-on-HyperV usage, as declaring _and using_ a local variable in a header that's only defined in one specific .c-file is all kinds of ugly. Opportunistically make svm_hv_enable_l2_tlb_flush() local to svm_onhyperv.c, as the only reason it was visible was due to the aforementioned shenanigans in svm_onhyperv.h. Alternatively, svm_x86_ops could be explicitly passed to svm_hv_hardware_setup() as a parameter. While that approach is slightly safer, e.g. avoids "hidden" updates, for better or worse, the Intel side of KVM has already chosen to expose vt_x86_ops (and vt_init_ops). Given that svm_x86_ops is only truly consumed by kvm_ops_update, the odds of a "hidden" update causing problems are extremely low. So, absent a strong reason to rework the VMX/TDX code, make svm_x86_ops visible, as having all updates use exactly "svm_x86_ops." is advantageous in its own right. No functional change intended. Link: https://lore.kernel.org/r/20250919215934.1590410-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* KVM L1 hypervisor optimizations on Hyper-V for SVM.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kvm_host.h>
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#include <asm/mshyperv.h>
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#include "svm.h"
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#include "svm_ops.h"
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#include "hyperv.h"
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#include "kvm_onhyperv.h"
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#include "svm_onhyperv.h"
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static int svm_hv_enable_l2_tlb_flush(struct kvm_vcpu *vcpu)
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{
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struct hv_vmcb_enlightenments *hve;
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hpa_t partition_assist_page = hv_get_partition_assist_page(vcpu);
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if (partition_assist_page == INVALID_PAGE)
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return -ENOMEM;
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hve = &to_svm(vcpu)->vmcb->control.hv_enlightenments;
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hve->partition_assist_page = partition_assist_page;
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hve->hv_vm_id = (unsigned long)vcpu->kvm;
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if (!hve->hv_enlightenments_control.nested_flush_hypercall) {
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hve->hv_enlightenments_control.nested_flush_hypercall = 1;
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vmcb_mark_dirty(to_svm(vcpu)->vmcb, HV_VMCB_NESTED_ENLIGHTENMENTS);
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}
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return 0;
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}
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__init void svm_hv_hardware_setup(void)
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{
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if (npt_enabled &&
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ms_hyperv.nested_features & HV_X64_NESTED_ENLIGHTENED_TLB) {
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pr_info(KBUILD_MODNAME ": Hyper-V enlightened NPT TLB flush enabled\n");
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svm_x86_ops.flush_remote_tlbs = hv_flush_remote_tlbs;
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svm_x86_ops.flush_remote_tlbs_range = hv_flush_remote_tlbs_range;
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}
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if (ms_hyperv.nested_features & HV_X64_NESTED_DIRECT_FLUSH) {
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int cpu;
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pr_info(KBUILD_MODNAME ": Hyper-V Direct TLB Flush enabled\n");
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for_each_online_cpu(cpu) {
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struct hv_vp_assist_page *vp_ap =
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hv_get_vp_assist_page(cpu);
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if (!vp_ap)
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continue;
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vp_ap->nested_control.features.directhypercall = 1;
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}
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svm_x86_ops.enable_l2_tlb_flush =
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svm_hv_enable_l2_tlb_flush;
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}
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}
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