diff options
Diffstat (limited to 'system/xen/xsa/xsa186-4.7-0002-hvm-fep-Allow-testing-of-instructions-crossing-the.patch')
| -rw-r--r-- | system/xen/xsa/xsa186-4.7-0002-hvm-fep-Allow-testing-of-instructions-crossing-the.patch | 28 |
1 files changed, 0 insertions, 28 deletions
diff --git a/system/xen/xsa/xsa186-4.7-0002-hvm-fep-Allow-testing-of-instructions-crossing-the.patch b/system/xen/xsa/xsa186-4.7-0002-hvm-fep-Allow-testing-of-instructions-crossing-the.patch deleted file mode 100644 index cb73a81042..0000000000 --- a/system/xen/xsa/xsa186-4.7-0002-hvm-fep-Allow-testing-of-instructions-crossing-the.patch +++ /dev/null @@ -1,28 +0,0 @@ -From: Andrew Cooper <andrew.cooper3@citrix.com> -Subject: hvm/fep: Allow testing of instructions crossing the -1 -> 0 virtual boundary - -The Force Emulation Prefix is named to follow its PV counterpart for cpuid or -rdtsc, but isn't really an instruction prefix. It behaves as a break-out into -Xen, with the purpose of emulating the next instruction in the current state. - -It is important to be able to test legal situations which occur in real -hardware, including instruction which cross certain boundaries, and -instructions starting at 0. - -Reported-by: Brian Marcotte <marcotte@panix.com> -Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> -Reviewed-by: Jan Beulich <jbeulich@suse.com> - ---- a/xen/arch/x86/hvm/hvm.c -+++ b/xen/arch/x86/hvm/hvm.c -@@ -3905,6 +3905,10 @@ void hvm_ud_intercept(struct cpu_user_re - { - regs->eip += sizeof(sig); - regs->eflags &= ~X86_EFLAGS_RF; -+ -+ /* Zero the upper 32 bits of %rip if not in long mode. */ -+ if ( !(hvm_long_mode_enabled(cur) && cs.attr.fields.l) ) -+ regs->eip = regs->_eip; - } - } - |