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[88.115.161.74]) by smtp.gmail.com with ESMTPSA id 10-20020ac2568a000000b004edc7f6ee44sm6495865lfr.234.2023.05.04.09.54.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 04 May 2023 09:54:47 -0700 (PDT) Date: Thu, 4 May 2023 19:54:28 +0300 From: Zhi Wang To: Tianyu Lan Cc: luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, jgross@suse.com, tiala@microsoft.com, kirill@shutemov.name, jiangshan.ljs@antgroup.com, peterz@infradead.org, ashish.kalra@amd.com, srutherford@google.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, pawan.kumar.gupta@linux.intel.com, adrian.hunter@intel.com, daniel.sneddon@linux.intel.com, alexander.shishkin@linux.intel.com, sandipan.das@amd.com, ray.huang@amd.com, brijesh.singh@amd.com, michael.roth@amd.com, thomas.lendacky@amd.com, venu.busireddy@oracle.com, sterritt@google.com, tony.luck@intel.com, samitolvanen@google.com, fenghua.yu@intel.com, pangupta@amd.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [RFC PATCH V5 05/15] clocksource/drivers/hyper-v: decrypt hyperv tsc page in sev-snp enlightened guest Message-ID: <20230504195428.00007eda.zhi.wang.linux@gmail.com> In-Reply-To: <20230501085726.544209-6-ltykernel@gmail.com> References: <20230501085726.544209-1-ltykernel@gmail.com> <20230501085726.544209-6-ltykernel@gmail.com> X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org On Mon, 1 May 2023 04:57:15 -0400 Tianyu Lan wrote: > From: Tianyu Lan > > 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 > --- > 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;