[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen master] VMX: fix DebugCtl MSR clearing
commit dfa625e15f3d6c374637f2bb789e1f444c2781c3 Author: Jan Beulich <jbeulich@xxxxxxxx> AuthorDate: Fri Aug 22 14:29:37 2014 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Aug 22 14:29:37 2014 +0200 VMX: fix DebugCtl MSR clearing The previous shortcut was wrong, as it bypassed the necessary vmwrite: All we really want to avoid if the guest writes zero is to add the MSR to the host-load list. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx> --- xen/arch/x86/hvm/vmx/vmx.c | 6 +----- 1 files changed, 1 insertions(+), 5 deletions(-) diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index fb65c7d..46eeee2 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -2246,8 +2246,6 @@ static int vmx_msr_write_intercept(unsigned int msr, uint64_t msr_content) int i, rc = 0; uint64_t supported = IA32_DEBUGCTLMSR_LBR | IA32_DEBUGCTLMSR_BTF; - if ( !msr_content ) - break; if ( msr_content & ~supported ) { /* Perhaps some other bits are supported in vpmu. */ @@ -2267,12 +2265,10 @@ static int vmx_msr_write_intercept(unsigned int msr, uint64_t msr_content) } if ( (rc < 0) || - (vmx_add_host_load_msr(msr) < 0) ) + (msr_content && (vmx_add_host_load_msr(msr) < 0)) ) hvm_inject_hw_exception(TRAP_machine_check, 0); else - { __vmwrite(GUEST_IA32_DEBUGCTL, msr_content); - } break; } -- generated by git-patchbot for /home/xen/git/xen.git#master _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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