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    Subject[PATCH v5 14/14] KVM: x86: Add kexec support for SEV Live Migration.
    Date
    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
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