On 5/1/23 03:57, Tianyu Lan wrote:
From: Tianyu Lan <tiala@xxxxxxxxxxxxx>
hv vp assist page is shared between sev snp guest and hyperv. Decrypt
the page when use it.
You aren't actually decrypting the page, you're changing the mapping from
private/encrypted to shared/unencrypted (hence the memset that follows to
clear the page to zeroes).
And please capitalize where necessary, e.g., SEV-SNP, Hyper-V, etc.
Thanks,
Tom
Signed-off-by: Tianyu Lan <tiala@xxxxxxxxxxxxx>
---
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 a5f9474f08e1..9f3e2d71d015 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);
}
