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| author | Sean Christopherson <[email protected]> | 2023-10-18 19:36:17 +0000 |
|---|---|---|
| committer | Sean Christopherson <[email protected]> | 2023-11-30 20:51:14 +0000 |
| commit | 770d6aa2e416fd26f0356e258c77a37574ad9b8c (patch) | |
| tree | 157c1317e0d9bca133d64f8003c39115d0c426f2 /arch/x86/kvm/svm/svm.c | |
| parent | KVM: nSVM: Advertise support for flush-by-ASID (diff) | |
| download | kernel-770d6aa2e416fd26f0356e258c77a37574ad9b8c.tar.gz kernel-770d6aa2e416fd26f0356e258c77a37574ad9b8c.zip | |
KVM: SVM: Explicitly require FLUSHBYASID to enable SEV support
Add a sanity check that FLUSHBYASID is available if SEV is supported in
hardware, as SEV (and beyond) guests are bound to a single ASID, i.e. KVM
can't "flush" by assigning a new, fresh ASID to the guest. If FLUSHBYASID
isn't supported for some bizarre reason, KVM would completely fail to do
TLB flushes for SEV+ guests (see pre_svm_run() and pre_sev_run()).
Cc: Tom Lendacky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
0 files changed, 0 insertions, 0 deletions