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| author | Maciej S. Szmigiero | 2022-05-23 18:26:58 +0200 |
|---|---|---|
| committer | Paolo Bonzini | 2022-05-25 21:26:35 +0200 |
| commit | 267b5e7e378afd260004cb37a66a6fcd641e3b53 (patch) | |
| tree | af356193ca979a9a320b24f56d23f1914b8341e1 /hw/ide/macio.c | |
| parent | hw/audio/ac97: Remove unneeded local variables (diff) | |
| download | qemu-267b5e7e378afd260004cb37a66a6fcd641e3b53.tar.gz qemu-267b5e7e378afd260004cb37a66a6fcd641e3b53.tar.xz qemu-267b5e7e378afd260004cb37a66a6fcd641e3b53.zip | |
target/i386/kvm: Fix disabling MPX on "-cpu host" with MPX-capable host
Since KVM commit 5f76f6f5ff96 ("KVM: nVMX: Do not expose MPX VMX controls when guest MPX disabled")
it is not possible to disable MPX on a "-cpu host" just by adding "-mpx"
there if the host CPU does indeed support MPX.
QEMU will fail to set MSR_IA32_VMX_TRUE_{EXIT,ENTRY}_CTLS MSRs in this case
and so trigger an assertion failure.
Instead, besides "-mpx" one has to explicitly add also
"-vmx-exit-clear-bndcfgs" and "-vmx-entry-load-bndcfgs" to QEMU command
line to make it work, which is a bit convoluted.
Make the MPX-related bits in FEAT_VMX_{EXIT,ENTRY}_CTLS dependent on MPX
being actually enabled so such workarounds are no longer necessary.
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Message-Id: <51aa2125c76363204cc23c27165e778097c33f0b.1653323077.git.maciej.szmigiero@oracle.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/ide/macio.c')
0 files changed, 0 insertions, 0 deletions