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, rientjes@google.com,
srutherford@google.com, luto@kernel.org, brijesh.singh@amd.com
Subject: [PATCH v5 14/14] KVM: x86: Add kexec support for SEV Live Migration.
Date: Mon, 30 Mar 2020 01:38:12 +0000 [thread overview]
Message-ID: <a823eb9c85b47bcd0a1447a50af968b3e2ae92fb.1585531159.git.ashish.kalra@amd.com> (raw)
In-Reply-To: <cover.1585531159.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 8fcee0b45231..ba6cce3c84af 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -34,6 +34,7 @@
#include <asm/hypervisor.h>
#include <asm/tlb.h>
#include <asm/cpuidle_haltpoll.h>
+#include <asm/e820/api.h>
static int kvmapf = 1;
@@ -357,6 +358,33 @@ 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 (kvm_para_has_feature(KVM_FEATURE_SEV_LIVE_MIGRATION) &&
+ (smp_processor_id() == 0)) {
+ unsigned long nr_pages;
+ int i;
+
+ for (i = 0; i < e820_table->nr_entries; i++) {
+ struct e820_entry *entry = &e820_table->entries[i];
+ unsigned long start_pfn, 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
prev parent reply other threads:[~2020-03-30 1:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 1:32 [PATCH v5 00/14] Add AMD SEV guest live migration support Ashish Kalra
2020-03-30 1:33 ` [PATCH v5 01/14] KVM: SVM: Add KVM_SEV SEND_START command Ashish Kalra
2020-03-30 1:34 ` [PATCH v5 02/14] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Ashish Kalra
2020-03-30 1:34 ` [PATCH v5 03/14] KVM: SVM: Add KVM_SEV_SEND_FINISH command Ashish Kalra
2020-03-30 1:34 ` [PATCH v5 04/14] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Ashish Kalra
2020-03-30 1:35 ` [PATCH v5 05/14] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Ashish Kalra
2020-03-30 1:35 ` [PATCH v5 06/14] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Ashish Kalra
2020-03-30 1:35 ` [PATCH v5 07/14] KVM: x86: Add AMD SEV specific Hypercall3 Ashish Kalra
2020-03-30 1:36 ` [PATCH v5 08/14] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall Ashish Kalra
2020-03-30 3:29 ` kbuild test robot
2020-03-30 1:36 ` [PATCH v5 09/14] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-03-30 1:36 ` [PATCH v5 10/14] mm: x86: Invoke hypercall when page encryption status is changed Ashish Kalra
2020-03-30 2:37 ` kbuild test robot
2020-03-30 1:37 ` [PATCH v5 11/14] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Ashish Kalra
2020-03-30 1:37 ` [PATCH v5 12/14] KVM: x86: Introduce KVM_PAGE_ENC_BITMAP_RESET ioctl Ashish Kalra
2020-03-30 1:37 ` [PATCH v5 13/14] KVM: x86: Introduce new KVM_FEATURE_SEV_LIVE_MIGRATION feature & Custom MSR Ashish Kalra
2020-03-30 1:38 ` Ashish Kalra [this message]
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