| Message ID | 20231016132819.1002933-21-michael.roth@amd.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support | expand |
On 10/16/23 15:27, Michael Roth wrote: > SEV-SNP relies on the restricted/protected memory support to run guests, > so make sure to enable that support with the > CONFIG_KVM_SW_PROTECTED_VM build option. > > Signed-off-by: Michael Roth<michael.roth@amd.com> > --- Why select KVM_SW_PROTECTED_VM and not KVM_GENERIC_PRIVATE_MEM? Paolo
On Mon, Oct 16, 2023 at 08:27:49AM -0500, Michael Roth wrote: > SEV-SNP relies on the restricted/protected memory support to run guests, > so make sure to enable that support with the > CONFIG_KVM_SW_PROTECTED_VM build option. > > Signed-off-by: Michael Roth <michael.roth@amd.com> > --- > arch/x86/kvm/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig > index 8452ed0228cb..71dc506aa3fb 100644 > --- a/arch/x86/kvm/Kconfig > +++ b/arch/x86/kvm/Kconfig > @@ -126,6 +126,7 @@ config KVM_AMD_SEV > bool "AMD Secure Encrypted Virtualization (SEV) support" > depends on KVM_AMD && X86_64 > depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m) > + select KVM_SW_PROTECTED_VM > help > Provides support for launching Encrypted VMs (SEV) and Encrypted VMs > with Encrypted State (SEV-ES) on AMD processors. > -- Kconfig doesn't like this one: WARNING: unmet direct dependencies detected for KVM_SW_PROTECTED_VM Depends on [n]: VIRTUALIZATION [=y] && EXPERT [=n] && X86_64 [=y] Selected by [m]: - KVM_AMD_SEV [=y] && VIRTUALIZATION [=y] && KVM_AMD [=m] && X86_64 [=y] && CRYPTO_DEV_SP_PSP [=y] && (KVM_AMD [=m]!=y || CRYPTO_DEV_CCP_DD [=m]!=m) WARNING: unmet direct dependencies detected for KVM_SW_PROTECTED_VM Depends on [n]: VIRTUALIZATION [=y] && EXPERT [=n] && X86_64 [=y] Selected by [m]: - KVM_AMD_SEV [=y] && VIRTUALIZATION [=y] && KVM_AMD [=m] && X86_64 [=y] && CRYPTO_DEV_SP_PSP [=y] && (KVM_AMD [=m]!=y || CRYPTO_DEV_CCP_DD [=m]!=m)
On Mon, Dec 18, 2023 at 11:13:50AM +0100, Borislav Petkov wrote: > On Mon, Oct 16, 2023 at 08:27:49AM -0500, Michael Roth wrote: > > SEV-SNP relies on the restricted/protected memory support to run guests, > > so make sure to enable that support with the > > CONFIG_KVM_SW_PROTECTED_VM build option. > > > > Signed-off-by: Michael Roth <michael.roth@amd.com> > > --- > > arch/x86/kvm/Kconfig | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig > > index 8452ed0228cb..71dc506aa3fb 100644 > > --- a/arch/x86/kvm/Kconfig > > +++ b/arch/x86/kvm/Kconfig > > @@ -126,6 +126,7 @@ config KVM_AMD_SEV > > bool "AMD Secure Encrypted Virtualization (SEV) support" > > depends on KVM_AMD && X86_64 > > depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m) > > + select KVM_SW_PROTECTED_VM > > help > > Provides support for launching Encrypted VMs (SEV) and Encrypted VMs > > with Encrypted State (SEV-ES) on AMD processors. > > -- > > Kconfig doesn't like this one: > > WARNING: unmet direct dependencies detected for KVM_SW_PROTECTED_VM > Depends on [n]: VIRTUALIZATION [=y] && EXPERT [=n] && X86_64 [=y] > Selected by [m]: > - KVM_AMD_SEV [=y] && VIRTUALIZATION [=y] && KVM_AMD [=m] && X86_64 [=y] && CRYPTO_DEV_SP_PSP [=y] && (KVM_AMD [=m]!=y || CRYPTO_DEV_CCP_DD [=m]!=m) > > WARNING: unmet direct dependencies detected for KVM_SW_PROTECTED_VM > Depends on [n]: VIRTUALIZATION [=y] && EXPERT [=n] && X86_64 [=y] > Selected by [m]: > - KVM_AMD_SEV [=y] && VIRTUALIZATION [=y] && KVM_AMD [=m] && X86_64 [=y] && CRYPTO_DEV_SP_PSP [=y] && (KVM_AMD [=m]!=y || CRYPTO_DEV_CCP_DD [=m]!=m) I think this is because KVM_SW_PROTECTED_VM requires EXPERT, which has to be set explicitly. But I think Paolo is right that KVM_GENERIC_PRIVATE_MEM is more appropriate, which does not require EXPERT. -Mike > > > -- > Regards/Gruss, > Boris. > > https://people.kernel.org/tglx/notes-about-netiquette >
On Wed, Dec 13, 2023 at 01:54:55PM +0100, Paolo Bonzini wrote: > On 10/16/23 15:27, Michael Roth wrote: > > SEV-SNP relies on the restricted/protected memory support to run guests, > > so make sure to enable that support with the > > CONFIG_KVM_SW_PROTECTED_VM build option. > > > > Signed-off-by: Michael Roth<michael.roth@amd.com> > > --- > > Why select KVM_SW_PROTECTED_VM and not KVM_GENERIC_PRIVATE_MEM? I'm not sure, maybe there were previous iterations where it made sense but KVM_GENERIC_PRIVATE_MEM definitely seems more appropriate now. I've changed it accordingly. -Mike > > Paolo > >
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 8452ed0228cb..71dc506aa3fb 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -126,6 +126,7 @@ config KVM_AMD_SEV bool "AMD Secure Encrypted Virtualization (SEV) support" depends on KVM_AMD && X86_64 depends on CRYPTO_DEV_SP_PSP && !(KVM_AMD=y && CRYPTO_DEV_CCP_DD=m) + select KVM_SW_PROTECTED_VM help Provides support for launching Encrypted VMs (SEV) and Encrypted VMs with Encrypted State (SEV-ES) on AMD processors.
SEV-SNP relies on the restricted/protected memory support to run guests, so make sure to enable that support with the CONFIG_KVM_SW_PROTECTED_VM build option. Signed-off-by: Michael Roth <michael.roth@amd.com> --- arch/x86/kvm/Kconfig | 1 + 1 file changed, 1 insertion(+)