[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging-4.12] x86/vmx: Fixup removals of MSR load/save list entries
commit 8457c15b981ba04c0709e6f25af3b76beb34cafa Author: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx> AuthorDate: Wed May 15 09:40:45 2019 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Wed May 15 09:40:45 2019 +0200 x86/vmx: Fixup removals of MSR load/save list entries Commit 540d5422 ("x86/vmx: Support removing MSRs from the host/guest load/save lists") introduced infrastructure finally exposed by commit fd32dcfe ("x86/vmx: Don't leak EFER.NXE into guest context") that led to a functional regression on Harpertown and earlier cores (Gen 1 VT-x) due to MSR count being incorrectly set in VMCS. As the result, as soon as guest EFER becomes equal to Xen EFER (which eventually happens in almost every 64-bit VM) and its MSR entry is supposed to be removed, a stale version of EFER is loaded into a guest instead causing almost immediate guest failure. Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx> master commit: e28c0ee3356f52f589bbae54e89aaed25c1f599d master date: 2019-04-09 10:58:18 +0100 --- xen/arch/x86/hvm/vmx/vmcs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c index 74f2a08cfd..45d18493df 100644 --- a/xen/arch/x86/hvm/vmx/vmcs.c +++ b/xen/arch/x86/hvm/vmx/vmcs.c @@ -1490,15 +1490,15 @@ int vmx_del_msr(struct vcpu *v, uint32_t msr, enum vmx_msr_list_type type) switch ( type ) { case VMX_MSR_HOST: - __vmwrite(VM_EXIT_MSR_LOAD_COUNT, vmx->host_msr_count--); + __vmwrite(VM_EXIT_MSR_LOAD_COUNT, --vmx->host_msr_count); break; case VMX_MSR_GUEST: - __vmwrite(VM_EXIT_MSR_STORE_COUNT, vmx->msr_save_count--); + __vmwrite(VM_EXIT_MSR_STORE_COUNT, --vmx->msr_save_count); /* Fallthrough */ case VMX_MSR_GUEST_LOADONLY: - __vmwrite(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_load_count--); + __vmwrite(VM_ENTRY_MSR_LOAD_COUNT, --vmx->msr_load_count); break; } -- generated by git-patchbot for /home/xen/git/xen.git#staging-4.12 _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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