diff mbox series

[V5,6/8] clocksource: hyper-v: Mark hyperv tsc page unencrypted in sev-snp enlightened guest

Message ID 20230810160412.820246-7-ltykernel@gmail.com
State New
Headers
Series x86/hyperv: Add AMD sev-snp enlightened guest support on hyperv |

Commit Message

Tianyu Lan Aug. 10, 2023, 4:04 p.m. UTC 
  From: Tianyu Lan <tiala@microsoft.com>

Hyper-V tsc page is shared with hypervisor and mark the page
unencrypted in sev-snp enlightened guest when it's used.

Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
---
 drivers/clocksource/hyperv_timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Dexuan Cui Aug. 11, 2023, 12:14 a.m. UTC | #1 
> From: Tianyu Lan <ltykernel@gmail.com>
> Sent: Thursday, August 10, 2023 9:04 AM
> [...]
> Hyper-V tsc page is shared with hypervisor and mark the page
> unencrypted in sev-snp enlightened guest when it's used.
> 
> Reviewed-by: Michael Kelley <mikelley@microsoft.com>
> Signed-off-by: Tianyu Lan <tiala@microsoft.com>

Reviewed-by: Dexuan Cui <decui@microsoft.com>

FWIW, it looks like __bss_decrypted is ignored in the case of
TDX. I'll get it to work for TDX in future.
diff mbox series

Patch

diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index e56307a81f4d..8ff7cd4e20bb 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -390,7 +390,7 @@  static __always_inline u64 read_hv_clock_msr(void)
 static union {
 	struct ms_hyperv_tsc_page page;
 	u8 reserved[PAGE_SIZE];
-} tsc_pg __aligned(PAGE_SIZE);
+} tsc_pg __bss_decrypted __aligned(PAGE_SIZE);
 
 static struct ms_hyperv_tsc_page *tsc_page = &tsc_pg.page;
 static unsigned long tsc_pfn;