diff options
| author | Neeraj Upadhyay <Neeraj.Upadhyay@amd.com> | 2025-08-28 12:33:17 +0530 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2025-08-28 17:57:19 +0200 |
| commit | 30c2b98aa84c76f2ae60e66dd4ec2d9497713359 (patch) | |
| tree | e83949c919410e4a1a9306bd938d559821c02f6f /arch/x86/coco/core.c | |
| parent | 1b558e14f3c17dc29ce2e8cd0b8bd385e108734b (diff) | |
x86/apic: Add new driver for Secure AVIC
The Secure AVIC feature provides SEV-SNP guests hardware acceleration for
performance sensitive APIC accesses while securely managing the guest-owned
APIC state through the use of a private APIC backing page.
This helps prevent the hypervisor from generating unexpected interrupts for
a vCPU or otherwise violate architectural assumptions around the APIC
behavior.
Add a new x2APIC driver that will serve as the base of the Secure AVIC
support. It is initially the same as the x2APIC physical driver (without IPI
callbacks), but will be modified as features are implemented.
As the new driver does not implement Secure AVIC features yet, if the
hypervisor sets the Secure AVIC bit in SEV_STATUS, maintain the existing
behavior to enforce the guest termination.
[ bp: Massage commit message. ]
Co-developed-by: Kishon Vijay Abraham I <kvijayab@amd.com>
Signed-off-by: Kishon Vijay Abraham I <kvijayab@amd.com>
Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Link: https://lore.kernel.org/20250828070334.208401-2-Neeraj.Upadhyay@amd.com
Diffstat (limited to 'arch/x86/coco/core.c')
| -rw-r--r-- | arch/x86/coco/core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c index d4610af68114..989ca9f72ba3 100644 --- a/arch/x86/coco/core.c +++ b/arch/x86/coco/core.c @@ -104,6 +104,9 @@ static bool noinstr amd_cc_platform_has(enum cc_attr attr) case CC_ATTR_HOST_SEV_SNP: return cc_flags.host_sev_snp; + case CC_ATTR_SNP_SECURE_AVIC: + return sev_status & MSR_AMD64_SNP_SECURE_AVIC; + default: return false; } |