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KVM: SVM: Mark SEV launch secret pages as dirty.

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The LAUNCH_SECRET command performs encryption of the
launch secret memory contents. Mark pinned pages as
dirty, before unpinning them.
This matches the logic in sev_launch_update_data().

Signed-off-by: Cfir Cohen <cfir@google.com>
Message-Id: <20200808003746.66687-1-cfir@google.com>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cfir Cohen 2020-08-07 17:37:46 -07:00 committed by Paolo Bonzini
parent fc595f3599
commit 50085beee8
1 changed files with 14 additions and 1 deletions
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15
arch/x86/kvm/svm/sev.c
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@ -856,7 +856,7 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
struct kvm_sev_launch_secret params; struct kvm_sev_launch_secret params;
struct page **pages; struct page **pages;
void *blob, *hdr; void *blob, *hdr;
unsigned long n; unsigned long n, i;
int ret, offset; int ret, offset;
if (!sev_guest(kvm)) if (!sev_guest(kvm))
@ -869,6 +869,14 @@ static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (IS_ERR(pages)) if (IS_ERR(pages))
return PTR_ERR(pages); return PTR_ERR(pages);
/*
* The LAUNCH_SECRET command will perform in-place encryption of the
* memory content (i.e it will write the same memory region with C=1).
* It's possible that the cache may contain the data with C=0, i.e.,
* unencrypted so invalidate it first.
*/
sev_clflush_pages(pages, n);
/* /*
* The secret must be copied into contiguous memory region, lets verify * The secret must be copied into contiguous memory region, lets verify
* that userspace memory pages are contiguous before we issue command. * that userspace memory pages are contiguous before we issue command.
@ -914,6 +922,11 @@ e_free_blob:
e_free: e_free:
kfree(data); kfree(data);
e_unpin_memory: e_unpin_memory:
/* content of memory is updated, mark pages dirty */
for (i = 0; i < n; i++) {
set_page_dirty_lock(pages[i]);
mark_page_accessed(pages[i]);
}
sev_unpin_memory(kvm, pages, n); sev_unpin_memory(kvm, pages, n);
return ret; return ret;
} }