Messages in this thread Patch in this message | | | From | Tianyu Lan <> | Subject | [PATCH 3/9] x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest | Date | Thu, 1 Jun 2023 11:16:16 -0400 |
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From: Tianyu Lan <tiala@microsoft.com>
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.
Signed-off-by: Tianyu Lan <tiala@microsoft.com> --- arch/x86/hyperv/hv_init.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index b4a2327c823b..331b855314b7 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -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> @@ -113,6 +114,11 @@ static int hv_cpu_init(unsigned int cpu) } if (!WARN_ON(!(*hvp))) { + if (hv_isolation_type_en_snp()) { + WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1)); + memset(*hvp, 0, PAGE_SIZE); + } + msr.enable = 1; wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64); } -- 2.25.1
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