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confidential guest support: Move SEV initialization into arch specific code

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While we've abstracted some (potential) differences between mechanisms for
securing guest memory, the initialization is still specific to SEV.  Given
that, move it into x86's kvm_arch_init() code, rather than the generic
kvm_init() code.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
This commit is contained in:
David Gibson 2020-10-16 14:52:30 +11:00
parent abc27d4241
commit ec78e2cda3
4 changed files with 28 additions and 17 deletions
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20
target/i386/kvm/kvm.c
View file

@ -42,6 +42,7 @@
#include "hw/i386/intel_iommu.h"
#include "hw/i386/x86-iommu.h"
#include "hw/i386/e820_memory_layout.h"
#include "sysemu/sev.h"
#include "hw/pci/pci.h"
#include "hw/pci/msi.h"
@ -2135,6 +2136,25 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
uint64_t shadow_mem;
int ret;
struct utsname utsname;
Error *local_err = NULL;
/*
* Initialize SEV context, if required
*
* If no memory encryption is requested (ms->cgs == NULL) this is
* a no-op.
*
* It's also a no-op if a non-SEV confidential guest support
* mechanism is selected. SEV is the only mechanism available to
* select on x86 at present, so this doesn't arise, but if new
* mechanisms are supported in future (e.g. TDX), they'll need
* their own initialization either here or elsewhere.
*/
ret = sev_kvm_init(ms->cgs, &local_err);
if (ret < 0) {
error_report_err(local_err);
return ret;
}
if (!kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
error_report("kvm: KVM_CAP_IRQ_ROUTING not supported by KVM");