diff mbox series

[v2,03/14] KVM: SVM: Move SEV module params/variables to sev.c

Message ID 20210114003708.3798992-4-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: SVM: Misc SEV cleanups | expand

Commit Message

Sean Christopherson Jan. 14, 2021, 12:36 a.m. UTC 
Unconditionally invoke sev_hardware_setup() when configuring SVM and
handle clearing the module params/variable 'sev' and 'sev_es' in
sev_hardware_setup().  This allows making said variables static within
sev.c and reduces the odds of a collision with guest code, e.g. the guest
side of things has already laid claim to 'sev_enabled'.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/svm/sev.c | 11 +++++++++++
 arch/x86/kvm/svm/svm.c | 15 +--------------
 arch/x86/kvm/svm/svm.h |  2 --
 3 files changed, 12 insertions(+), 16 deletions(-)

Comments

Tom Lendacky Jan. 14, 2021, 7:07 p.m. UTC | #1 
On 1/13/21 6:36 PM, Sean Christopherson wrote:
> Unconditionally invoke sev_hardware_setup() when configuring SVM and
> handle clearing the module params/variable 'sev' and 'sev_es' in
> sev_hardware_setup().  This allows making said variables static within
> sev.c and reduces the odds of a collision with guest code, e.g. the guest
> side of things has already laid claim to 'sev_enabled'.
> 
> Signed-off-by: Sean Christopherson <seanjc@google.com>

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>

> ---
>   arch/x86/kvm/svm/sev.c | 11 +++++++++++
>   arch/x86/kvm/svm/svm.c | 15 +--------------
>   arch/x86/kvm/svm/svm.h |  2 --
>   3 files changed, 12 insertions(+), 16 deletions(-)
>
Brijesh Singh Jan. 14, 2021, 8:59 p.m. UTC | #2 
On 1/13/21 6:36 PM, Sean Christopherson wrote:
> Unconditionally invoke sev_hardware_setup() when configuring SVM and
> handle clearing the module params/variable 'sev' and 'sev_es' in
> sev_hardware_setup().  This allows making said variables static within
> sev.c and reduces the odds of a collision with guest code, e.g. the guest
> side of things has already laid claim to 'sev_enabled'.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  arch/x86/kvm/svm/sev.c | 11 +++++++++++
>  arch/x86/kvm/svm/svm.c | 15 +--------------
>  arch/x86/kvm/svm/svm.h |  2 --
>  3 files changed, 12 insertions(+), 16 deletions(-)


Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>


>
> diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
> index 0eeb6e1b803d..8ba93b8fa435 100644
> --- a/arch/x86/kvm/svm/sev.c
> +++ b/arch/x86/kvm/svm/sev.c
> @@ -27,6 +27,14 @@
>  
>  #define __ex(x) __kvm_handle_fault_on_reboot(x)
>  
> +/* enable/disable SEV support */
> +static int sev = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
> +module_param(sev, int, 0444);
> +
> +/* enable/disable SEV-ES support */
> +static int sev_es = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
> +module_param(sev_es, int, 0444);
> +
>  static u8 sev_enc_bit;
>  static int sev_flush_asids(void);
>  static DECLARE_RWSEM(sev_deactivate_lock);
> @@ -1249,6 +1257,9 @@ void __init sev_hardware_setup(void)
>  	bool sev_es_supported = false;
>  	bool sev_supported = false;
>  
> +	if (!IS_ENABLED(CONFIG_KVM_AMD_SEV) || !sev)
> +		goto out;
> +
>  	/* Does the CPU support SEV? */
>  	if (!boot_cpu_has(X86_FEATURE_SEV))
>  		goto out;
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index ccf52c5531fb..f89f702b2a58 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -189,14 +189,6 @@ module_param(vls, int, 0444);
>  static int vgif = true;
>  module_param(vgif, int, 0444);
>  
> -/* enable/disable SEV support */
> -int sev = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
> -module_param(sev, int, 0444);
> -
> -/* enable/disable SEV-ES support */
> -int sev_es = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
> -module_param(sev_es, int, 0444);
> -
>  bool __read_mostly dump_invalid_vmcb;
>  module_param(dump_invalid_vmcb, bool, 0644);
>  
> @@ -976,12 +968,7 @@ static __init int svm_hardware_setup(void)
>  		kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
>  	}
>  
> -	if (IS_ENABLED(CONFIG_KVM_AMD_SEV) && sev) {
> -		sev_hardware_setup();
> -	} else {
> -		sev = false;
> -		sev_es = false;
> -	}
> +	sev_hardware_setup();
>  
>  	svm_adjust_mmio_mask();
>  
> diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
> index 0fe874ae5498..8e169835f52a 100644
> --- a/arch/x86/kvm/svm/svm.h
> +++ b/arch/x86/kvm/svm/svm.h
> @@ -408,8 +408,6 @@ static inline bool gif_set(struct vcpu_svm *svm)
>  #define MSR_CR3_LONG_MBZ_MASK			0xfff0000000000000U
>  #define MSR_INVALID				0xffffffffU
>  
> -extern int sev;
> -extern int sev_es;
>  extern bool dump_invalid_vmcb;
>  
>  u32 svm_msrpm_offset(u32 msr);
diff mbox series

Patch

diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 0eeb6e1b803d..8ba93b8fa435 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -27,6 +27,14 @@ 
 
 #define __ex(x) __kvm_handle_fault_on_reboot(x)
 
+/* enable/disable SEV support */
+static int sev = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
+module_param(sev, int, 0444);
+
+/* enable/disable SEV-ES support */
+static int sev_es = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
+module_param(sev_es, int, 0444);
+
 static u8 sev_enc_bit;
 static int sev_flush_asids(void);
 static DECLARE_RWSEM(sev_deactivate_lock);
@@ -1249,6 +1257,9 @@  void __init sev_hardware_setup(void)
 	bool sev_es_supported = false;
 	bool sev_supported = false;
 
+	if (!IS_ENABLED(CONFIG_KVM_AMD_SEV) || !sev)
+		goto out;
+
 	/* Does the CPU support SEV? */
 	if (!boot_cpu_has(X86_FEATURE_SEV))
 		goto out;
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index ccf52c5531fb..f89f702b2a58 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -189,14 +189,6 @@  module_param(vls, int, 0444);
 static int vgif = true;
 module_param(vgif, int, 0444);
 
-/* enable/disable SEV support */
-int sev = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
-module_param(sev, int, 0444);
-
-/* enable/disable SEV-ES support */
-int sev_es = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
-module_param(sev_es, int, 0444);
-
 bool __read_mostly dump_invalid_vmcb;
 module_param(dump_invalid_vmcb, bool, 0644);
 
@@ -976,12 +968,7 @@  static __init int svm_hardware_setup(void)
 		kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
 	}
 
-	if (IS_ENABLED(CONFIG_KVM_AMD_SEV) && sev) {
-		sev_hardware_setup();
-	} else {
-		sev = false;
-		sev_es = false;
-	}
+	sev_hardware_setup();
 
 	svm_adjust_mmio_mask();
 
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 0fe874ae5498..8e169835f52a 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -408,8 +408,6 @@  static inline bool gif_set(struct vcpu_svm *svm)
 #define MSR_CR3_LONG_MBZ_MASK			0xfff0000000000000U
 #define MSR_INVALID				0xffffffffU
 
-extern int sev;
-extern int sev_es;
 extern bool dump_invalid_vmcb;
 
 u32 svm_msrpm_offset(u32 msr);