[kvm-unit-tests,v5,07/11] lib/x86: Move xsave helpers to lib/

Commit Message

Vasant Karasulli Aug. 21, 2023, 2:47 p.m. UTC

Processing CPUID #VC for AMD SEV-ES requires copying xcr0 into GHCB.
Move the xsave read/write helpers used by xsave testcase to lib/x86
to share as common code.

Signed-off-by: Varad Gautam <[e-mail]>
Signed-off-by: Vasant Karasulli <[e-mail]>
Reviewed-by: Marc Orr <[e-mail]>
---
 lib/x86/xsave.c     | 40 ++++++++++++++++++++++++++++++++++++++++
 lib/x86/xsave.h     | 16 ++++++++++++++++
 x86/Makefile.common |  1 +
 x86/xsave.c         | 42 +-----------------------------------------
 4 files changed, 58 insertions(+), 41 deletions(-)
 create mode 100644 lib/x86/xsave.c
 create mode 100644 lib/x86/xsave.h

--
2.34.1

Patch

diff --git a/lib/x86/xsave.c b/lib/x86/xsave.c
new file mode 100644
index 0000000..5f05f88
--- /dev/null
+++ b/lib/x86/xsave.c
@@ -0,0 +1,40 @@ 
+// SPDX-License-Identifier: GPL-2.0
+
+#include "libcflat.h"
+#include "xsave.h"
+#include "processor.h"
+
+int xgetbv_checking(u32 index, u64 *result)
+{
+	u32 eax, edx;
+
+	asm volatile(ASM_TRY("1f")
+		".byte 0x0f,0x01,0xd0\n\t" /* xgetbv */
+		"1:"
+		: "=a" (eax), "=d" (edx)
+		: "c" (index));
+	*result = eax + ((u64)edx << 32);
+	return exception_vector();
+}
+
+int xsetbv_safe(u32 index, u64 value)
+{
+	u32 eax = value;
+	u32 edx = value >> 32;
+
+	asm volatile(ASM_TRY("1f")
+		".byte 0x0f,0x01,0xd1\n\t" /* xsetbv */
+		"1:"
+		: : "a" (eax), "d" (edx), "c" (index));
+	return exception_vector();
+}
+
+uint64_t get_supported_xcr0(void)
+{
+	struct cpuid r;
+
+	r = cpuid_indexed(0xd, 0);
+	printf("eax %x, ebx %x, ecx %x, edx %x\n",
+		r.a, r.b, r.c, r.d);
+	return r.a + ((u64)r.d << 32);
+}
diff --git a/lib/x86/xsave.h b/lib/x86/xsave.h
new file mode 100644
index 0000000..12757c1
--- /dev/null
+++ b/lib/x86/xsave.h
@@ -0,0 +1,16 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _X86_XSAVE_H_
+#define _X86_XSAVE_H_
+
+#define XCR_XFEATURE_ENABLED_MASK       0x00000000
+#define XCR_XFEATURE_ILLEGAL_MASK       0x00000010
+
+#define XSTATE_FP       0x1
+#define XSTATE_SSE      0x2
+#define XSTATE_YMM      0x4
+
+int xgetbv_checking(u32 index, u64 *result);
+int xsetbv_safe(u32 index, u64 value);
+uint64_t get_supported_xcr0(void);
+
+#endif
diff --git a/x86/Makefile.common b/x86/Makefile.common
index 25ae6f7..fefeefa 100644
--- a/x86/Makefile.common
+++ b/x86/Makefile.common
@@ -22,6 +22,7 @@  cflatobjs += lib/x86/isr.o
 cflatobjs += lib/x86/stack.o
 cflatobjs += lib/x86/fault_test.o
 cflatobjs += lib/x86/delay.o
+cflatobjs += lib/x86/xsave.o
 cflatobjs += lib/x86/pmu.o
 ifeq ($(CONFIG_EFI),y)
 cflatobjs += lib/x86/amd_sev.o
diff --git a/x86/xsave.c b/x86/xsave.c
index 39a55d6..d44f9ff 100644
--- a/x86/xsave.c
+++ b/x86/xsave.c
@@ -1,6 +1,7 @@ 
 #include "libcflat.h"
 #include "desc.h"
 #include "processor.h"
+#include "xsave.h"

 #ifdef __x86_64__
 #define uint64_t unsigned long
@@ -8,47 +9,6 @@ 
 #define uint64_t unsigned long long
 #endif

-static int xgetbv_checking(u32 index, u64 *result)
-{
-    u32 eax, edx;
-
-    asm volatile(ASM_TRY("1f")
-            ".byte 0x0f,0x01,0xd0\n\t" /* xgetbv */
-            "1:"
-            : "=a" (eax), "=d" (edx)
-            : "c" (index));
-    *result = eax + ((u64)edx << 32);
-    return exception_vector();
-}
-
-static int xsetbv_safe(u32 index, u64 value)
-{
-    u32 eax = value;
-    u32 edx = value >> 32;
-
-    asm volatile(ASM_TRY("1f")
-            ".byte 0x0f,0x01,0xd1\n\t" /* xsetbv */
-            "1:"
-            : : "a" (eax), "d" (edx), "c" (index));
-    return exception_vector();
-}
-
-static uint64_t get_supported_xcr0(void)
-{
-    struct cpuid r;
-    r = cpuid_indexed(0xd, 0);
-    printf("eax %x, ebx %x, ecx %x, edx %x\n",
-            r.a, r.b, r.c, r.d);
-    return r.a + ((u64)r.d << 32);
-}
-
-#define XCR_XFEATURE_ENABLED_MASK       0x00000000
-#define XCR_XFEATURE_ILLEGAL_MASK       0x00000010
-
-#define XSTATE_FP       0x1
-#define XSTATE_SSE      0x2
-#define XSTATE_YMM      0x4
-
 static void test_xsave(void)
 {
     unsigned long cr4;