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[v8,23/40] KVM: x86: move lookup of indexed CPUID leafs to helper

Message ID 20211210154332.11526-24-brijesh.singh@amd.com
State New
Headers show
Series Add AMD Secure Nested Paging (SEV-SNP) Guest Support | expand

Commit Message

Brijesh Singh Dec. 10, 2021, 3:43 p.m. UTC 
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.

Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
 arch/x86/include/asm/cpuid.h | 26 ++++++++++++++++++++++++++
 arch/x86/kvm/cpuid.c         | 17 ++---------------
 2 files changed, 28 insertions(+), 15 deletions(-)
 create mode 100644 arch/x86/include/asm/cpuid.h

Comments

Venu Busireddy Jan. 6, 2022, 6:46 p.m. UTC | #1 
On 2021-12-10 09:43:15 -0600, Brijesh Singh wrote:
> 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.
> 
> Signed-off-by: Michael Roth <michael.roth@amd.com>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>

Reviewed-by: Venu Busireddy <venu.busireddy@oracle.com>

> ---
>  arch/x86/include/asm/cpuid.h | 26 ++++++++++++++++++++++++++
>  arch/x86/kvm/cpuid.c         | 17 ++---------------
>  2 files changed, 28 insertions(+), 15 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..61426eb1f665
> --- /dev/null
> +++ b/arch/x86/include/asm/cpuid.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +#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 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 07e9215e911d..6b99e8e87480 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"
> @@ -626,22 +627,8 @@ 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 0x1f:
> -	case 0x8000001d:
> +	if (cpuid_function_is_indexed(function))
>  		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
> -		break;
> -	}
>  
>  	return entry;
>  }
> -- 
> 2.25.1
>
diff mbox series

Patch

diff --git a/arch/x86/include/asm/cpuid.h b/arch/x86/include/asm/cpuid.h
new file mode 100644
index 000000000000..61426eb1f665
--- /dev/null
+++ b/arch/x86/include/asm/cpuid.h
@@ -0,0 +1,26 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+#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 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 07e9215e911d..6b99e8e87480 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"
@@ -626,22 +627,8 @@  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 0x1f:
-	case 0x8000001d:
+	if (cpuid_function_is_indexed(function))
 		entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
-		break;
-	}
 
 	return entry;
 }