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KVM: selftests: Move XGETBV and XSETBV helpers to common code

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The instructions XGETBV and XSETBV are useful to other tests.  Move
them to processor.h to make them more broadly available.

No functional change intended.

Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Reviewed-by: Mingwei Zhang <mizhang@google.com>
[sean: reword shortlog]
Reviewed-by: Aaron Lewis <aaronlewis@google.com>
Tested-by: Aaron Lewis <aaronlewis@google.com>
Link: https://lore.kernel.org/r/20230405004520.421768-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Aaron Lewis 2023-04-04 17:45:17 -07:00 committed by Sean Christopherson
parent 55cd57b596
commit b213812d3f
2 changed files with 21 additions and 21 deletions
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18
tools/testing/selftests/kvm/include/x86_64/processor.h
View File

@ -510,6 +510,24 @@ static inline void set_cr4(uint64_t val)
__asm__ __volatile__("mov %0, %%cr4" : : "r" (val) : "memory");
}
static inline u64 xgetbv(u32 index)
{
u32 eax, edx;
__asm__ __volatile__("xgetbv;"
: "=a" (eax), "=d" (edx)
: "c" (index));
return eax | ((u64)edx << 32);
}
static inline void xsetbv(u32 index, u64 value)
{
u32 eax = value;
u32 edx = value >> 32;
__asm__ __volatile__("xsetbv" :: "a" (eax), "d" (edx), "c" (index));
}
static inline struct desc_ptr get_gdt(void)
{
struct desc_ptr gdt;

24
tools/testing/selftests/kvm/x86_64/amx_test.c
View File

@ -65,24 +65,6 @@ struct xtile_info {
static struct xtile_info xtile;
static inline u64 __xgetbv(u32 index)
{
u32 eax, edx;
asm volatile("xgetbv;"
: "=a" (eax), "=d" (edx)
: "c" (index));
return eax + ((u64)edx << 32);
}
static inline void __xsetbv(u32 index, u64 value)
{
u32 eax = value;
u32 edx = value >> 32;
asm volatile("xsetbv" :: "a" (eax), "d" (edx), "c" (index));
}
static inline void __ldtilecfg(void *cfg)
{
asm volatile(".byte 0xc4,0xe2,0x78,0x49,0x00"
@ -160,10 +142,10 @@ static void init_regs(void)
set_cr4(cr4);
GUEST_ASSERT(this_cpu_has(X86_FEATURE_OSXSAVE));
xcr0 = __xgetbv(0);
xcr0 = xgetbv(0);
xcr0 |= XFEATURE_MASK_XTILE;
__xsetbv(0x0, xcr0);
GUEST_ASSERT((__xgetbv(0) & XFEATURE_MASK_XTILE) == XFEATURE_MASK_XTILE);
xsetbv(0x0, xcr0);
GUEST_ASSERT((xgetbv(0) & XFEATURE_MASK_XTILE) == XFEATURE_MASK_XTILE);
}
static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,