Jan Beulich 8eed56995d x86emul: ignore VEX.W for BMI{1,2} insns in 32-bit mode ...

While result values and other status flags are unaffected as long as we
can ignore the case of registers having their upper 32 bits non-zero
outside of 64-bit mode, EFLAGS.SF may obtain a wrong value when we
mistakenly re-execute the original insn with VEX.W set.

Note that guest the memory access, if any, is correctly carried out as
32-bit regardless of VEX.W. The emulator-local memory operand will be
accessed as a 64-bit quantity, but it is pre-initialised to zero so no
internal state can leak.

Fixes: 771daacd19 ("x86emul: support BMI1 insns")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 1179d51dcb
master date: 2024-11-14 13:00:57 +0100

2024-11-25 12:17:49 +01:00

..

cpu-policy

x86/cpu-policy: Infrastructure for MSR_ARCH_CAPS

2023-05-24 19:04:41 +01:00

depriv

Only compile the hypervisor with -Wdeclaration-after-statement

2023-12-12 14:26:18 +01:00

paging-mempool

tools: rename xen-tools/libs.h file to common-macros.h

2023-03-22 09:57:19 +01:00

resource

tests/resource: Fix HVM guest in !SHADOW builds

2024-04-02 16:23:54 +02:00

tsx

x86/tsx: Expose RTM_ALWAYS_ABORT to guests

2024-04-09 16:45:01 +01:00

vpci

vPCI: fix test harness build

2023-05-31 16:04:30 +02:00

x86_emulator

x86emul: ignore VEX.W for BMI{1,2} insns in 32-bit mode

2024-11-25 12:17:49 +01:00

xenstore

tools/tests: let test-xenstore exit with non-0 status in case of error

2024-07-04 14:07:12 +02:00

Makefile

tools/tests: Unit test for paging mempool size

2022-11-17 16:51:51 +00:00