mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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3899152ccb
KVM emulates MSR_IA32_VMX_CR{0,4}_FIXED1 with the value -1ULL, meaning
all CR0 and CR4 bits are allowed to be 1 during VMX operation.
This does not match real hardware, which disallows the high 32 bits of
CR0 to be 1, and disallows reserved bits of CR4 to be 1 (including bits
which are defined in the SDM but missing according to CPUID). A guest
can induce a VM-entry failure by setting these bits in GUEST_CR0 and
GUEST_CR4, despite MSR_IA32_VMX_CR{0,4}_FIXED1 indicating they are
valid.
Since KVM has allowed all bits to be 1 in CR0 and CR4, the existing
checks on these registers do not verify must-be-0 bits. Fix these checks
to identify must-be-0 bits according to MSR_IA32_VMX_CR{0,4}_FIXED1.
This patch should introduce no change in behavior in KVM, since these
MSRs are still -1ULL.
Signed-off-by: David Matlack <dmatlack@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
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| .. | ||
| boot | ||
| configs | ||
| crypto | ||
| entry | ||
| events | ||
| ia32 | ||
| include | ||
| kernel | ||
| kvm | ||
| lguest | ||
| lib | ||
| math-emu | ||
| mm | ||
| net | ||
| oprofile | ||
| pci | ||
| platform | ||
| power | ||
| purgatory | ||
| ras | ||
| realmode | ||
| tools | ||
| um | ||
| video | ||
| xen | ||
| .gitignore | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
| Makefile_32.cpu | ||
| Makefile.um | ||