[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen stable-4.10] x86/vmx: Don't clobber %dr6 while debugging state is lazy
commit 6feafd89d255bdfbc4402ad92db0591751b48d54 Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> AuthorDate: Mon Jul 30 11:41:34 2018 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Mon Jul 30 11:41:34 2018 +0200 x86/vmx: Don't clobber %dr6 while debugging state is lazy c/s 4f36452b63 introduced a write to %dr6 in the #DB intercept case, but the guests debug registers may be lazy at this point, at which point the guests later attempt to read %dr6 will discard this value and use the older stale value. Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx> master commit: 3cdac2805692c7accde2f405d81cc0be799aee48 master date: 2018-07-19 14:06:48 +0100 --- xen/arch/x86/hvm/vmx/vmx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c index d18b900691..48d3c54e84 100644 --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -3721,6 +3721,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs) */ __vmread(EXIT_QUALIFICATION, &exit_qualification); HVMTRACE_1D(TRAP_DEBUG, exit_qualification); + __restore_debug_registers(v); write_debugreg(6, exit_qualification | DR_STATUS_RESERVED_ONE); if ( !v->domain->debugger_attached ) { -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.10 _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
|
![]() |
Lists.xenproject.org is hosted with RackSpace, monitoring our |