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[5/7] svm: add SVM_BARE_VMRUN

Message ID 20220208122148.912913-6-mlevitsk@redhat.com (mailing list archive)
State New, archived
Headers show
Series My set of KVM unit tests + fixes | expand

Commit Message

Maxim Levitsky Feb. 8, 2022, 12:21 p.m. UTC 
This will be useful in nested LBR tests to ensure that no extra
branches are made in the guest entry.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
---
 x86/svm.c | 32 --------------------------------
 x86/svm.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 32 deletions(-)
diff mbox series

Patch

diff --git a/x86/svm.c b/x86/svm.c
index 62da2af..6f4e023 100644
--- a/x86/svm.c
+++ b/x86/svm.c
@@ -196,41 +196,9 @@  struct regs get_regs(void)
 
 // rax handled specially below
 
-#define SAVE_GPR_C                              \
-        "xchg %%rbx, regs+0x8\n\t"              \
-        "xchg %%rcx, regs+0x10\n\t"             \
-        "xchg %%rdx, regs+0x18\n\t"             \
-        "xchg %%rbp, regs+0x28\n\t"             \
-        "xchg %%rsi, regs+0x30\n\t"             \
-        "xchg %%rdi, regs+0x38\n\t"             \
-        "xchg %%r8, regs+0x40\n\t"              \
-        "xchg %%r9, regs+0x48\n\t"              \
-        "xchg %%r10, regs+0x50\n\t"             \
-        "xchg %%r11, regs+0x58\n\t"             \
-        "xchg %%r12, regs+0x60\n\t"             \
-        "xchg %%r13, regs+0x68\n\t"             \
-        "xchg %%r14, regs+0x70\n\t"             \
-        "xchg %%r15, regs+0x78\n\t"
-
-#define LOAD_GPR_C      SAVE_GPR_C
 
 struct svm_test *v2_test;
 
-#define ASM_PRE_VMRUN_CMD                       \
-                "vmload %%rax\n\t"              \
-                "mov regs+0x80, %%r15\n\t"      \
-                "mov %%r15, 0x170(%%rax)\n\t"   \
-                "mov regs, %%r15\n\t"           \
-                "mov %%r15, 0x1f8(%%rax)\n\t"   \
-                LOAD_GPR_C                      \
-
-#define ASM_POST_VMRUN_CMD                      \
-                SAVE_GPR_C                      \
-                "mov 0x170(%%rax), %%r15\n\t"   \
-                "mov %%r15, regs+0x80\n\t"      \
-                "mov 0x1f8(%%rax), %%r15\n\t"   \
-                "mov %%r15, regs\n\t"           \
-                "vmsave %%rax\n\t"              \
 
 u64 guest_stack[10000];
 
diff --git a/x86/svm.h b/x86/svm.h
index f74b13a..6d072f4 100644
--- a/x86/svm.h
+++ b/x86/svm.h
@@ -416,10 +416,57 @@  void vmcb_ident(struct vmcb *vmcb);
 struct regs get_regs(void);
 void vmmcall(void);
 int __svm_vmrun(u64 rip);
+void __svm_bare_vmrun(void);
 int svm_vmrun(void);
 void test_set_guest(test_guest_func func);
 
 extern struct vmcb *vmcb;
 extern struct svm_test svm_tests[];
 
+
+#define SAVE_GPR_C                              \
+        "xchg %%rbx, regs+0x8\n\t"              \
+        "xchg %%rcx, regs+0x10\n\t"             \
+        "xchg %%rdx, regs+0x18\n\t"             \
+        "xchg %%rbp, regs+0x28\n\t"             \
+        "xchg %%rsi, regs+0x30\n\t"             \
+        "xchg %%rdi, regs+0x38\n\t"             \
+        "xchg %%r8, regs+0x40\n\t"              \
+        "xchg %%r9, regs+0x48\n\t"              \
+        "xchg %%r10, regs+0x50\n\t"             \
+        "xchg %%r11, regs+0x58\n\t"             \
+        "xchg %%r12, regs+0x60\n\t"             \
+        "xchg %%r13, regs+0x68\n\t"             \
+        "xchg %%r14, regs+0x70\n\t"             \
+        "xchg %%r15, regs+0x78\n\t"
+
+#define LOAD_GPR_C      SAVE_GPR_C
+
+#define ASM_PRE_VMRUN_CMD                       \
+                "vmload %%rax\n\t"              \
+                "mov regs+0x80, %%r15\n\t"      \
+                "mov %%r15, 0x170(%%rax)\n\t"   \
+                "mov regs, %%r15\n\t"           \
+                "mov %%r15, 0x1f8(%%rax)\n\t"   \
+                LOAD_GPR_C                      \
+
+#define ASM_POST_VMRUN_CMD                      \
+                SAVE_GPR_C                      \
+                "mov 0x170(%%rax), %%r15\n\t"   \
+                "mov %%r15, regs+0x80\n\t"      \
+                "mov 0x1f8(%%rax), %%r15\n\t"   \
+                "mov %%r15, regs\n\t"           \
+                "vmsave %%rax\n\t"              \
+
+
+
+#define SVM_BARE_VMRUN \
+	asm volatile ( \
+		ASM_PRE_VMRUN_CMD \
+                "vmrun %%rax\n\t"               \
+		ASM_POST_VMRUN_CMD \
+		: \
+		: "a" (virt_to_phys(vmcb)) \
+		: "memory", "r15") \
+
 #endif