diff mbox series

[v3,6/8] KVM: selftests: Hoist XGETBV and XSETBV to make them more accessible

Message ID 20230224223607.1580880-7-aaronlewis@google.com (mailing list archive)
State New, archived
Headers show
Series Clean up the supported xfeatures | expand

Commit Message

Aaron Lewis Feb. 24, 2023, 10:36 p.m. UTC 
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>
---
 .../selftests/kvm/include/x86_64/processor.h  | 18 ++++++++++++++
 tools/testing/selftests/kvm/x86_64/amx_test.c | 24 +++----------------
 2 files changed, 21 insertions(+), 21 deletions(-)

Comments

Mingwei Zhang March 3, 2023, 9:24 p.m. UTC | #1 
On Fri, Feb 24, 2023, Aaron Lewis wrote:
> 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>
diff mbox series

Patch

diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 53ffa43c90db..62dc54c8e0c4 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -496,6 +496,24 @@  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;
diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c
index bd72c6eb3b67..4b733ad21831 100644
--- a/tools/testing/selftests/kvm/x86_64/amx_test.c
+++ b/tools/testing/selftests/kvm/x86_64/amx_test.c
@@ -68,24 +68,6 @@  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"
@@ -121,7 +103,7 @@  static inline void check_cpuid_xsave(void)
 
 static bool check_xsave_supports_xtile(void)
 {
-	return __xgetbv(0) & XFEATURE_MASK_XTILE;
+	return xgetbv(0) & XFEATURE_MASK_XTILE;
 }
 
 static void check_xtile_info(void)
@@ -177,9 +159,9 @@  static void init_regs(void)
 	cr4 |= X86_CR4_OSXSAVE;
 	set_cr4(cr4);
 
-	xcr0 = __xgetbv(0);
+	xcr0 = xgetbv(0);
 	xcr0 |= XFEATURE_MASK_XTILE;
-	__xsetbv(0x0, xcr0);
+	xsetbv(0x0, xcr0);
 }
 
 static void __attribute__((__flatten__)) guest_code(struct tile_config *amx_cfg,