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Subject[PATCH v12 30/46] KVM: x86: Move lookup of indexed CPUID leafs to helper
Date
From: Michael Roth <michael.roth@amd.com>

Determining which CPUID leafs have significant ECX/index values is
also needed by guest kernel code when doing SEV-SNP-validated CPUID
lookups. Move this to common code to keep future updates in sync.

Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
arch/x86/include/asm/cpuid.h | 34 ++++++++++++++++++++++++++++++++++
arch/x86/kvm/cpuid.c | 19 ++-----------------
2 files changed, 36 insertions(+), 17 deletions(-)
create mode 100644 arch/x86/include/asm/cpuid.h

diff --git a/arch/x86/include/asm/cpuid.h b/arch/x86/include/asm/cpuid.h
new file mode 100644
index 000000000000..70b2db18165e
--- /dev/null
+++ b/arch/x86/include/asm/cpuid.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * CPUID-related helpers/definitions
+ *
+ * Derived from arch/x86/kvm/cpuid.c
+ */
+
+#ifndef _ASM_X86_CPUID_H
+#define _ASM_X86_CPUID_H
+
+static __always_inline bool cpuid_function_is_indexed(u32 function)
+{
+ switch (function) {
+ case 4:
+ case 7:
+ case 0xb:
+ case 0xd:
+ case 0xf:
+ case 0x10:
+ case 0x12:
+ case 0x14:
+ case 0x17:
+ case 0x18:
+ case 0x1d:
+ case 0x1e:
+ case 0x1f:
+ case 0x8000001d:
+ return true;
+ }
+
+ return false;
+}
+
+#endif /* _ASM_X86_CPUID_H */
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 8bf541b24b4b..848ad1723fae 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -19,6 +19,7 @@
#include <asm/user.h>
#include <asm/fpu/xstate.h>
#include <asm/sgx.h>
+#include <asm/cpuid.h>
#include "cpuid.h"
#include "lapic.h"
#include "mmu.h"
@@ -722,24 +723,8 @@ static struct kvm_cpuid_entry2 *do_host_cpuid(struct kvm_cpuid_array *array,
cpuid_count(entry->function, entry->index,
&entry->eax, &entry->ebx, &entry->ecx, &entry->edx);

- switch (function) {
- case 4:
- case 7:
- case 0xb:
- case 0xd:
- case 0xf:
- case 0x10:
- case 0x12:
- case 0x14:
- case 0x17:
- case 0x18:
- case 0x1d:
- case 0x1e:
- case 0x1f:
- case 0x8000001d:
+ if (cpuid_function_is_indexed(function))
entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
- break;
- }

return entry;
}
--
2.25.1
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