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x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest

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hv vp assist page needs to be shared between SEV-SNP guest and Hyper-V.
So mark the page unencrypted in the SEV-SNP guest.

Reviewed-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230818102919.1318039-4-ltykernel@gmail.com
This commit is contained in:
Tianyu Lan 2023-08-18 06:29:13 -04:00 committed by Wei Liu
parent 8387ce06d7
commit b13103559d
1 changed files with 15 additions and 1 deletions
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16
arch/x86/hyperv/hv_init.c
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@ -18,6 +18,7 @@
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
#include <asm/idtentry.h>
#include <asm/set_memory.h>
#include <linux/kexec.h>
#include <linux/version.h>
#include <linux/vmalloc.h>
@ -106,8 +107,21 @@ static int hv_cpu_init(unsigned int cpu)
* in hv_cpu_die(), otherwise a CPU may not be stopped in the
* case of CPU offlining and the VM will hang.
*/
if (!*hvp)
if (!*hvp) {
*hvp = __vmalloc(PAGE_SIZE, GFP_KERNEL | __GFP_ZERO);
/*
* Hyper-V should never specify a VM that is a Confidential
* VM and also running in the root partition. Root partition
* is blocked to run in Confidential VM. So only decrypt assist
* page in non-root partition here.
*/
if (*hvp && hv_isolation_type_en_snp()) {
WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1));
memset(*hvp, 0, PAGE_SIZE);
}
}
if (*hvp)
msr.pfn = vmalloc_to_pfn(*hvp);