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Subject[RFC PATCH V3 06/16] x86/hyperv: decrypt vmbus pages for sev-snp enlightened guest
Date
From: Tianyu Lan <tiala@microsoft.com>

Vmbus post msg, synic event and message pages are shared
with hypervisor and so decrypt these pages in the sev-snp guest.

Signed-off-by: Tianyu Lan <tiala@microsoft.com>
---
Change since RFC V2:
* Fix error in the error code path and encrypt
pages correctly when decryption failure happens.
---
drivers/hv/hv.c | 33 ++++++++++++++++++++++++++++++++-
1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index 410e6c4e80d3..52edc54c8172 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -20,6 +20,7 @@
#include <linux/interrupt.h>
#include <clocksource/hyperv_timer.h>
#include <asm/mshyperv.h>
+#include <linux/set_memory.h>
#include "hyperv_vmbus.h"

/* The one and only */
@@ -117,7 +118,7 @@ int hv_post_message(union hv_connection_id connection_id,

int hv_synic_alloc(void)
{
- int cpu;
+ int cpu, ret;
struct hv_per_cpu_context *hv_cpu;

/*
@@ -168,9 +169,39 @@ int hv_synic_alloc(void)
pr_err("Unable to allocate post msg page\n");
goto err;
}
+
+ if (hv_isolation_type_en_snp()) {
+ ret = set_memory_decrypted((unsigned long)
+ hv_cpu->synic_message_page, 1);
+ if (ret)
+ goto err;
+
+ ret = set_memory_decrypted((unsigned long)
+ hv_cpu->synic_event_page, 1);
+ if (ret)
+ goto err_decrypt_event_page;
+
+ ret = set_memory_decrypted((unsigned long)
+ hv_cpu->post_msg_page, 1);
+ if (ret)
+ goto err_decrypt_msg_page;
+
+ memset(hv_cpu->synic_message_page, 0, PAGE_SIZE);
+ memset(hv_cpu->synic_event_page, 0, PAGE_SIZE);
+ memset(hv_cpu->post_msg_page, 0, PAGE_SIZE);
+ }
}

return 0;
+
+err_decrypt_msg_page:
+ set_memory_encrypted((unsigned long)
+ hv_cpu->synic_event_page, 1);
+
+err_decrypt_event_page:
+ set_memory_encrypted((unsigned long)
+ hv_cpu->synic_message_page, 1);
+
err:
/*
* Any memory allocations that succeeded will be freed when
--
2.25.1
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