From: Ashish Kalra <Ashish.Kalra@amd.com> To: pbonzini@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, joro@8bytes.org, bp@suse.de, thomas.lendacky@amd.com, x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, srutherford@google.com, rientjes@google.com, venu.busireddy@oracle.com, brijesh.singh@amd.com, kexec@lists.infradead.org Subject: [PATCH v7 18/18] KVM: x86: Add kexec support for SEV Live Migration. Date: Thu, 30 Apr 2020 08:48:29 +0000 [thread overview] Message-ID: <0adf76ea0f88e137bef5e045ebf96ebb004ee8df.1588234824.git.ashish.kalra@amd.com> (raw) In-Reply-To: <cover.1588234824.git.ashish.kalra@amd.com> From: Ashish Kalra <ashish.kalra@amd.com> Reset the host's page encryption bitmap related to kernel specific page encryption status settings before we load a new kernel by kexec. We cannot reset the complete page encryption bitmap here as we need to retain the UEFI/OVMF firmware specific settings. Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> --- arch/x86/kernel/kvm.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 8b8cc87a3461..68f2de4c1e74 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -35,6 +35,7 @@ #include <asm/hypervisor.h> #include <asm/tlb.h> #include <asm/cpuidle_haltpoll.h> +#include <asm/e820/api.h> static int kvmapf = 1; @@ -358,6 +359,33 @@ static void kvm_pv_guest_cpu_reboot(void *unused) */ if (kvm_para_has_feature(KVM_FEATURE_PV_EOI)) wrmsrl(MSR_KVM_PV_EOI_EN, 0); + /* + * Reset the host's page encryption bitmap related to kernel + * specific page encryption status settings before we load a + * new kernel by kexec. NOTE: We cannot reset the complete + * page encryption bitmap here as we need to retain the + * UEFI/OVMF firmware specific settings. + */ + if (sev_live_migration_enabled() & (smp_processor_id() == 0)) { + int i; + unsigned long nr_pages; + + for (i = 0; i < e820_table->nr_entries; i++) { + struct e820_entry *entry = &e820_table->entries[i]; + unsigned long start_pfn; + unsigned long end_pfn; + + if (entry->type != E820_TYPE_RAM) + continue; + + start_pfn = entry->addr >> PAGE_SHIFT; + end_pfn = (entry->addr + entry->size) >> PAGE_SHIFT; + nr_pages = DIV_ROUND_UP(entry->size, PAGE_SIZE); + + kvm_sev_hypercall3(KVM_HC_PAGE_ENC_STATUS, + entry->addr, nr_pages, 1); + } + } kvm_pv_disable_apf(); kvm_disable_steal_time(); } -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Ashish Kalra <Ashish.Kalra@amd.com> To: pbonzini@redhat.com Cc: thomas.lendacky@amd.com, brijesh.singh@amd.com, kvm@vger.kernel.org, srutherford@google.com, joro@8bytes.org, x86@kernel.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com, rientjes@google.com, tglx@linutronix.de, bp@suse.de, venu.busireddy@oracle.com Subject: [PATCH v7 18/18] KVM: x86: Add kexec support for SEV Live Migration. Date: Thu, 30 Apr 2020 08:48:29 +0000 [thread overview] Message-ID: <0adf76ea0f88e137bef5e045ebf96ebb004ee8df.1588234824.git.ashish.kalra@amd.com> (raw) In-Reply-To: <cover.1588234824.git.ashish.kalra@amd.com> From: Ashish Kalra <ashish.kalra@amd.com> Reset the host's page encryption bitmap related to kernel specific page encryption status settings before we load a new kernel by kexec. We cannot reset the complete page encryption bitmap here as we need to retain the UEFI/OVMF firmware specific settings. Signed-off-by: Ashish Kalra <ashish.kalra@amd.com> --- arch/x86/kernel/kvm.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 8b8cc87a3461..68f2de4c1e74 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -35,6 +35,7 @@ #include <asm/hypervisor.h> #include <asm/tlb.h> #include <asm/cpuidle_haltpoll.h> +#include <asm/e820/api.h> static int kvmapf = 1; @@ -358,6 +359,33 @@ static void kvm_pv_guest_cpu_reboot(void *unused) */ if (kvm_para_has_feature(KVM_FEATURE_PV_EOI)) wrmsrl(MSR_KVM_PV_EOI_EN, 0); + /* + * Reset the host's page encryption bitmap related to kernel + * specific page encryption status settings before we load a + * new kernel by kexec. NOTE: We cannot reset the complete + * page encryption bitmap here as we need to retain the + * UEFI/OVMF firmware specific settings. + */ + if (sev_live_migration_enabled() & (smp_processor_id() == 0)) { + int i; + unsigned long nr_pages; + + for (i = 0; i < e820_table->nr_entries; i++) { + struct e820_entry *entry = &e820_table->entries[i]; + unsigned long start_pfn; + unsigned long end_pfn; + + if (entry->type != E820_TYPE_RAM) + continue; + + start_pfn = entry->addr >> PAGE_SHIFT; + end_pfn = (entry->addr + entry->size) >> PAGE_SHIFT; + nr_pages = DIV_ROUND_UP(entry->size, PAGE_SIZE); + + kvm_sev_hypercall3(KVM_HC_PAGE_ENC_STATUS, + entry->addr, nr_pages, 1); + } + } kvm_pv_disable_apf(); kvm_disable_steal_time(); } -- 2.17.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2020-04-30 8:48 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-04-30 8:39 [PATCH v7 00/18] Add AMD SEV guest live migration support Ashish Kalra 2020-04-30 8:40 ` [PATCH v7 01/18] KVM: SVM: Add KVM_SEV SEND_START command Ashish Kalra 2020-05-04 21:07 ` Venu Busireddy 2020-05-04 22:36 ` Ashish Kalra 2020-05-04 23:10 ` Venu Busireddy 2020-05-04 23:37 ` Ashish Kalra 2020-04-30 8:40 ` [PATCH v7 02/18] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Ashish Kalra 2020-05-04 21:13 ` Venu Busireddy 2020-04-30 8:41 ` [PATCH v7 03/18] KVM: SVM: Add KVM_SEV_SEND_FINISH command Ashish Kalra 2020-05-04 21:21 ` Venu Busireddy 2020-04-30 8:42 ` [PATCH v7 04/18] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Ashish Kalra 2020-05-04 21:37 ` Venu Busireddy 2020-04-30 8:42 ` [PATCH v7 05/18] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Ashish Kalra 2020-04-30 8:42 ` [PATCH v7 06/18] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Ashish Kalra 2020-05-04 21:41 ` Venu Busireddy 2020-04-30 8:42 ` [PATCH v7 07/18] KVM: x86: Add AMD SEV specific Hypercall3 Ashish Kalra 2020-04-30 8:43 ` [PATCH v7 08/18] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall Ashish Kalra 2020-04-30 8:43 ` [PATCH v7 09/18] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Ashish Kalra 2020-05-04 21:52 ` Venu Busireddy 2020-04-30 8:43 ` [PATCH v7 10/18] x86/paravirt: Add hypervisor specific hypercall for SEV live migration Ashish Kalra 2020-05-01 11:00 ` kbuild test robot 2020-05-01 11:00 ` kbuild test robot 2020-05-01 11:00 ` [RFC PATCH] x86/paravirt: kvm_sev_migration_hcall() can be static kbuild test robot 2020-05-01 11:00 ` kbuild test robot 2020-04-30 8:45 ` [PATCH v7 11/18] mm: x86: Invoke hypercall when page encryption status is changed Ashish Kalra 2020-04-30 9:49 ` Jürgen Groß 2020-04-30 15:21 ` Brijesh Singh 2020-04-30 15:37 ` Jürgen Groß 2020-04-30 8:45 ` [PATCH v7 12/18] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Ashish Kalra 2020-04-30 8:45 ` [PATCH v7 13/18] KVM: SVM: Add support for static allocation of unified Page Encryption Bitmap Ashish Kalra 2020-04-30 8:46 ` [PATCH v7 14/18] KVM: x86: Introduce new KVM_FEATURE_SEV_LIVE_MIGRATION feature & Custom MSR Ashish Kalra 2020-04-30 8:46 ` [PATCH v7 15/18] EFI: Introduce the new AMD Memory Encryption GUID Ashish Kalra 2020-04-30 8:46 ` [PATCH v7 16/18] KVM: x86: Add guest support for detecting and enabling SEV Live Migration feature Ashish Kalra 2020-04-30 16:42 ` kbuild test robot 2020-04-30 16:42 ` kbuild test robot 2020-04-30 8:47 ` [PATCH v7 17/18] KVM: x86: Mark _bss_decrypted section variables as decrypted in page encryption bitmap Ashish Kalra 2020-04-30 8:48 ` Ashish Kalra [this message] 2020-04-30 8:48 ` [PATCH v7 18/18] KVM: x86: Add kexec support for SEV Live Migration Ashish Kalra
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