3202de9857
this exposes the FLUSHBYASID CPU flag to nested VMs when running on an AMD CPU. also reverts a made up check that would advertise FLUSHBYASID as not supported. this enable certain modern hypervisors such as VMWare ESXi 7 and Workstation 17 to run nested VMs properly again. Signed-off-by: Stefan Sterz <s.sterz@proxmox.com>
50 lines
1.4 KiB
Diff
50 lines
1.4 KiB
Diff
From 379ad2e0326c55682d0bb9391f16f1072fe400d2 Mon Sep 17 00:00:00 2001
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From: Stefan Sterz <s.sterz@proxmox.com>
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Date: Wed, 18 Oct 2023 10:45:45 +0200
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Subject: [PATCH 1/2] Revert "nSVM: Check for reserved encodings of TLB_CONTROL
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in nested VMCB"
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This reverts commit 174a921b6975ef959dd82ee9e8844067a62e3ec1.
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Signed-off-by: Stefan Sterz <s.sterz@proxmox.com>
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---
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arch/x86/kvm/svm/nested.c | 15 ---------------
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1 file changed, 15 deletions(-)
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diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
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index add65dd59756..61a6c0235519 100644
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--- a/arch/x86/kvm/svm/nested.c
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+++ b/arch/x86/kvm/svm/nested.c
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@@ -242,18 +242,6 @@ static bool nested_svm_check_bitmap_pa(struct kvm_vcpu *vcpu, u64 pa, u32 size)
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kvm_vcpu_is_legal_gpa(vcpu, addr + size - 1);
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}
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-static bool nested_svm_check_tlb_ctl(struct kvm_vcpu *vcpu, u8 tlb_ctl)
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-{
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- /* Nested FLUSHBYASID is not supported yet. */
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- switch(tlb_ctl) {
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- case TLB_CONTROL_DO_NOTHING:
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- case TLB_CONTROL_FLUSH_ALL_ASID:
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- return true;
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- default:
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- return false;
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- }
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-}
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-
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static bool __nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
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struct vmcb_ctrl_area_cached *control)
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{
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@@ -273,9 +261,6 @@ static bool __nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
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IOPM_SIZE)))
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return false;
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- if (CC(!nested_svm_check_tlb_ctl(vcpu, control->tlb_ctl)))
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- return false;
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-
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return true;
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}
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--
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2.39.2
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