diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2023-06-06 09:51:26 -0500 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-06-06 18:31:37 +0200 |
| commit | 6c3211796326a9d35618b866826ca556c8f008a8 (patch) | |
| tree | 1c7688af3e1e4ff079a6875cc8c2cf3ba8781b51 /arch/x86/boot/compressed/mem.c | |
| parent | 15d9088779b8693cffe47527ea4f9ff8fde4cd03 (diff) | |
| download | linux-6c3211796326a9d35618b866826ca556c8f008a8.tar.gz linux-6c3211796326a9d35618b866826ca556c8f008a8.tar.bz2 linux-6c3211796326a9d35618b866826ca556c8f008a8.zip | |
x86/sev: Add SNP-specific unaccepted memory support
Add SNP-specific hooks to the unaccepted memory support in the boot
path (__accept_memory()) and the core kernel (accept_memory()) in order
to support booting SNP guests when unaccepted memory is present. Without
this support, SNP guests will fail to boot and/or panic() when unaccepted
memory is present in the EFI memory map.
The process of accepting memory under SNP involves invoking the hypervisor
to perform a page state change for the page to private memory and then
issuing a PVALIDATE instruction to accept the page.
Since the boot path and the core kernel paths perform similar operations,
move the pvalidate_pages() and vmgexit_psc() functions into sev-shared.c
to avoid code duplication.
Create the new header file arch/x86/boot/compressed/sev.h because adding
the function declaration to any of the existing SEV related header files
pulls in too many other header files, causing the build to fail.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/a52fa69f460fd1876d70074b20ad68210dfc31dd.1686063086.git.thomas.lendacky@amd.com
Diffstat (limited to 'arch/x86/boot/compressed/mem.c')
| -rw-r--r-- | arch/x86/boot/compressed/mem.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/mem.c b/arch/x86/boot/compressed/mem.c index f04b29f3572f..3c1609245f2a 100644 --- a/arch/x86/boot/compressed/mem.c +++ b/arch/x86/boot/compressed/mem.c @@ -3,6 +3,7 @@ #include "error.h" #include "misc.h" #include "tdx.h" +#include "sev.h" #include <asm/shared/tdx.h> /* @@ -37,6 +38,8 @@ void arch_accept_memory(phys_addr_t start, phys_addr_t end) if (early_is_tdx_guest()) { if (!tdx_accept_memory(start, end)) panic("TDX: Failed to accept memory\n"); + } else if (sev_snp_enabled()) { + snp_accept_memory(start, end); } else { error("Cannot accept memory: unknown platform\n"); } |