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| author | Brijesh Singh <brijesh.singh@amd.com> | 2024-01-25 22:11:06 -0600 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-01-29 17:25:55 +0100 |
| commit | 94b36bc244bb134ec616dd3f2d37343cd8c1be54 (patch) | |
| tree | 1e607e72327731e4f108a487b500df58a247bcdd /arch/x86/include/asm/sev.h | |
| parent | e3fd08afb7c350d5612f113eadfb4ebb6ed08deb (diff) | |
| download | lwn-94b36bc244bb134ec616dd3f2d37343cd8c1be54.tar.gz lwn-94b36bc244bb134ec616dd3f2d37343cd8c1be54.zip | |
x86/sev: Add RMP entry lookup helpers
Add a helper that can be used to access information contained in the RMP
entry corresponding to a particular PFN. This will be needed to make
decisions on how to handle setting up mappings in the NPT in response to
guest page-faults and handling things like cleaning up pages and setting
them back to the default hypervisor-owned state when they are no longer
being used for private data.
[ mdr: separate 'assigned' indicator from return code, and simplify
function signatures for various helpers. ]
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Co-developed-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240126041126.1927228-7-michael.roth@amd.com
Diffstat (limited to 'arch/x86/include/asm/sev.h')
| -rw-r--r-- | arch/x86/include/asm/sev.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h index 1f59d8ba9776..01ce61b283a3 100644 --- a/arch/x86/include/asm/sev.h +++ b/arch/x86/include/asm/sev.h @@ -90,6 +90,7 @@ extern bool handle_vc_boot_ghcb(struct pt_regs *regs); /* RMP page size */ #define RMP_PG_SIZE_4K 0 #define RMP_PG_SIZE_2M 1 +#define RMP_TO_PG_LEVEL(level) (((level) == RMP_PG_SIZE_4K) ? PG_LEVEL_4K : PG_LEVEL_2M) #define RMPADJUST_VMSA_PAGE_BIT BIT(16) @@ -245,8 +246,10 @@ static inline u64 sev_get_status(void) { return 0; } #ifdef CONFIG_KVM_AMD_SEV bool snp_probe_rmptable_info(void); +int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level); #else static inline bool snp_probe_rmptable_info(void) { return false; } +static inline int snp_lookup_rmpentry(u64 pfn, bool *assigned, int *level) { return -ENODEV; } #endif #endif |