[RFC,V5,05/15] clocksource/drivers/hyper-v: decrypt hyperv tsc page in sev-snp enlightened guest
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From: Tianyu Lan <ltykernel@gmail.com>
To: luto@kernel.org, tglx@linutronix.de, mingo@redhat.com,
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Cc: pangupta@amd.com, linux-kernel@vger.kernel.org,
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Subject: [RFC PATCH V5 05/15] clocksource/drivers/hyper-v: decrypt hyperv tsc
page in sev-snp enlightened guest
Date: Mon, 1 May 2023 04:57:15 -0400
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x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv
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Commit Message
Tianyu Lan
May 1, 2023, 8:57 a.m. UTC
From: Tianyu Lan <tiala@microsoft.com> Hyper-V tsc page is shared with hypervisor and it should be decrypted in sev-snp enlightened guest when it's used. Signed-off-by: Tianyu Lan <tiala@microsoft.com> --- Change since RFC V2: * Change the Subject line prefix --- drivers/clocksource/hyperv_timer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Comments
On Mon, 1 May 2023 04:57:15 -0400 Tianyu Lan <ltykernel@gmail.com> wrote: > From: Tianyu Lan <tiala@microsoft.com> > > Hyper-V tsc page is shared with hypervisor and it should > be decrypted in sev-snp enlightened guest when it's used. > > Signed-off-by: Tianyu Lan <tiala@microsoft.com> > --- > Change since RFC V2: > * Change the Subject line prefix > --- > drivers/clocksource/hyperv_timer.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c > index bcd9042a0c9f..66e29a19770b 100644 > --- a/drivers/clocksource/hyperv_timer.c > +++ b/drivers/clocksource/hyperv_timer.c > @@ -376,7 +376,7 @@ EXPORT_SYMBOL_GPL(hv_stimer_global_cleanup); > static union { > struct ms_hyperv_tsc_page page; > u8 reserved[PAGE_SIZE]; > -} tsc_pg __aligned(PAGE_SIZE); > +} tsc_pg __bss_decrypted __aligned(PAGE_SIZE); > Out of curiosity, this is not a on/off for VM with paravisor and full-enlightened VM, how does change affect the case of VM with paravisor? I assume the VM with paravisor works fine without this previously. > static struct ms_hyperv_tsc_page *tsc_page = &tsc_pg.page; > static unsigned long tsc_pfn;
diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c index bcd9042a0c9f..66e29a19770b 100644 --- a/drivers/clocksource/hyperv_timer.c +++ b/drivers/clocksource/hyperv_timer.c @@ -376,7 +376,7 @@ EXPORT_SYMBOL_GPL(hv_stimer_global_cleanup); 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;