[Xen-devel] [V6 1/4] x86/xsaves: add basic definitions/helpers to support xsaves

[Shuai Ruan <shuai.ruan@xxxxxxxxxxxxxxx>]

This patch add basic definitions/helpers which will be used in
later patches.

Signed-off-by: Shuai Ruan <shuai.ruan@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/xstate.c           | 16 ++++++++++++++++
 xen/include/asm-x86/hvm/vcpu.h  |  1 +
 xen/include/asm-x86/msr-index.h |  2 ++
 xen/include/asm-x86/xstate.h    | 25 ++++++++++++++++++++++++-
 4 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/xstate.c b/xen/arch/x86/xstate.c
index 9ddff90..730368a 100644
--- a/xen/arch/x86/xstate.c
+++ b/xen/arch/x86/xstate.c
@@ -23,6 +23,11 @@ static u32 __read_mostly xsave_cntxt_size;
 
 /* A 64-bit bitmask of the XSAVE/XRSTOR features supported by processor. */
 u64 __read_mostly xfeature_mask;
+unsigned int * __read_mostly xstate_offsets;
+unsigned int * __read_mostly xstate_sizes;
+
+/* Cached xss for fast read */
+static DEFINE_PER_CPU(uint64_t, xss);
 
 /* Cached xcr0 for fast read */
 static DEFINE_PER_CPU(uint64_t, xcr0);
@@ -60,6 +65,17 @@ uint64_t get_xcr0(void)
     return this_cpu(xcr0);
 }
 
+void set_msr_xss(u64 xss)
+{
+    wrmsrl(MSR_IA32_XSS, xss);
+    this_cpu(xss) = xss;
+}
+
+uint64_t get_msr_xss(void)
+{
+    return this_cpu(xss);
+}
+
 void xsave(struct vcpu *v, uint64_t mask)
 {
     struct xsave_struct *ptr = v->arch.xsave_area;
diff --git a/xen/include/asm-x86/hvm/vcpu.h b/xen/include/asm-x86/hvm/vcpu.h
index f553814..de81f8a 100644
--- a/xen/include/asm-x86/hvm/vcpu.h
+++ b/xen/include/asm-x86/hvm/vcpu.h
@@ -173,6 +173,7 @@ struct hvm_vcpu {
 
     u32                 msr_tsc_aux;
     u64                 msr_tsc_adjust;
+    u64                 msr_xss;
 
     union {
         struct arch_vmx_struct vmx;
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index e9c4723..4e5b31f 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -58,6 +58,8 @@
 
 #define MSR_IA32_BNDCFGS               0x00000D90
 
+#define MSR_IA32_XSS                   0x00000da0
+
 #define MSR_MTRRfix64K_00000           0x00000250
 #define MSR_MTRRfix16K_80000           0x00000258
 #define MSR_MTRRfix16K_A0000           0x00000259
diff --git a/xen/include/asm-x86/xstate.h b/xen/include/asm-x86/xstate.h
index f0d8f0b..f23435a 100644
--- a/xen/include/asm-x86/xstate.h
+++ b/xen/include/asm-x86/xstate.h
@@ -19,7 +19,11 @@
 
 #define XCR_XFEATURE_ENABLED_MASK 0x00000000  /* index of XCR0 */
 
+#define XSAVE_HDR_SIZE            64
+#define XSAVE_SSE_OFFSET          160
 #define XSTATE_YMM_SIZE           256
+#define FXSAVE_SIZE               512
+#define XSAVE_HDR_OFFSET          FXSAVE_SIZE
 #define XSTATE_AREA_MIN_SIZE      (512 + 64)  /* FP/SSE + XSAVE.HEADER */
 
 #define XSTATE_FP      (1ULL << 0)
@@ -38,8 +42,24 @@
 #define XSTATE_ALL     (~(1ULL << 63))
 #define XSTATE_NONLAZY (XSTATE_LWP | XSTATE_BNDREGS | XSTATE_BNDCSR)
 #define XSTATE_LAZY    (XSTATE_ALL & ~XSTATE_NONLAZY)
+#define XSTATE_COMPACTION_ENABLED  (1ULL << 63)
+
+#define XSTATE_FIXUP ".section .fixup,\"ax\"      \n"        \
+                     "2: mov %5,%%ecx             \n"        \
+                     "   xor %1,%1                \n"        \
+                     "   rep stosb                \n"        \
+                     "   lea %2,%0                \n"        \
+                     "   mov %3,%1                \n"        \
+                     "   jmp 1b                   \n"        \
+                     ".previous                   \n"        \
+                     _ASM_EXTABLE(1b, 2b)                    \
+                     : "+&D" (ptr), "+&a" (lmask)            \
+                     : "m" (*ptr), "g" (lmask), "d" (hmask), \
+                       "m" (xsave_cntxt_size)                \
+                     : "ecx"
 
 extern u64 xfeature_mask;
+extern unsigned int *xstate_offsets, *xstate_sizes;
 
 /* extended state save area */
 struct __packed __attribute__((aligned (64))) xsave_struct
@@ -68,7 +88,8 @@ struct __packed __attribute__((aligned (64))) xsave_struct
 
     struct {
         u64 xstate_bv;
-        u64 reserved[7];
+        u64 xcomp_bv;
+        u64 reserved[6];
     } xsave_hdr;                             /* The 64-byte header */
 
     struct { char x[XSTATE_YMM_SIZE]; } ymm; /* YMM */
@@ -78,6 +99,8 @@ struct __packed __attribute__((aligned (64))) xsave_struct
 /* extended state operations */
 bool_t __must_check set_xcr0(u64 xfeatures);
 uint64_t get_xcr0(void);
+void set_msr_xss(u64 xss);
+uint64_t get_msr_xss(void);
 void xsave(struct vcpu *v, uint64_t mask);
 void xrstor(struct vcpu *v, uint64_t mask);
 bool_t xsave_enabled(const struct vcpu *v);
-- 
1.9.1


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