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authorBrijesh Singh <brijesh.singh@amd.com>2022-04-22 08:56:24 -0500
committerBorislav Petkov <bp@suse.de>2022-04-27 13:31:38 +0200
commitc2106a231c2ba36ff9af50cdf2867b9a5f8150a6 (patch)
tree9b1e88b57fa942f2f31375b44d321fb140d42e8b /lib/kunit
parent75d359ec4141b013727022a663762931f69e6510 (diff)
x86/sev: Get the AP jump table address from secrets page
The GHCB specification section 2.7 states that when SEV-SNP is enabled, a guest should not rely on the hypervisor to provide the address of the AP jump table. Instead, if a guest BIOS wants to provide an AP jump table, it should record the address in the SNP secrets page so the guest operating system can obtain it directly from there. Fix this on the guest kernel side by having SNP guests use the AP jump table address published in the secrets page rather than issuing a GHCB request to get it. [ mroth: - Improve error handling when ioremap()/memremap() return NULL - Don't mix function calls with declarations - Add missing __init - Tweak commit message ] Fixes: 0afb6b660a6b ("x86/sev: Use SEV-SNP AP creation to start secondary CPUs") Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Michael Roth <michael.roth@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220422135624.114172-3-michael.roth@amd.com
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