[PATCH] x86emul: increase FPU save area in test harness/fuzzer

[PATCH] x86emul: increase FPU save area in test harness/fuzzer

[Jan Beulich]

Running them on a system (or emulator) with AMX support requires this
to be quite a bit larger than 8k, to avoid triggering the assert() in
emul_test_init(). Bump all the way up to 16k right away.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
Intel's Software Development Emulator properly reports XSAVE-related AMX
CPUID data for Sapphire Rapids emulation as of 8.59.0.

--- a/tools/tests/x86_emulator/x86-emulate.c
+++ b/tools/tests/x86_emulator/x86-emulate.c
@@ -33,7 +33,7 @@
 uint32_t mxcsr_mask = 0x0000ffbf;
 struct cpuid_policy cp;
 
-static char fpu_save_area[4096] __attribute__((__aligned__((64))));
+static char fpu_save_area[0x4000] __attribute__((__aligned__((64))));
 static bool use_xsave;
 
 /*

Re: [PATCH] x86emul: increase FPU save area in test harness/fuzzer

[Andrew Cooper]

On 22/10/2020 14:39, Jan Beulich wrote:
> Running them on a system (or emulator) with AMX support requires this
> to be quite a bit larger than 8k, to avoid triggering the assert() in
> emul_test_init(). Bump all the way up to 16k right away.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>

> ---
> Intel's Software Development Emulator properly reports XSAVE-related AMX
> CPUID data for Sapphire Rapids emulation as of 8.59.0.
>
> --- a/tools/tests/x86_emulator/x86-emulate.c
> +++ b/tools/tests/x86_emulator/x86-emulate.c
> @@ -33,7 +33,7 @@
>  uint32_t mxcsr_mask = 0x0000ffbf;
>  struct cpuid_policy cp;
>  
> -static char fpu_save_area[4096] __attribute__((__aligned__((64))));
> +static char fpu_save_area[0x4000] __attribute__((__aligned__((64))));
>  static bool use_xsave;
>  
>  /*