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authorMarc Zyngier <marc.zyngier@arm.com>2019-01-19 15:29:54 +0000
committerMarc Zyngier <marc.zyngier@arm.com>2019-02-19 21:05:35 +0000
commit32f139551954512bfdf9d558341af453bb8b12b4 (patch)
treed7fc878ae67aab3ab2300b3ca72e51f03ff3482b /arch/arm/include
parentd18232ea8a9480606c53e91d7e2d062c3c151815 (diff)
arm/arm64: KVM: Statically configure the host's view of MPIDR
We currently eagerly save/restore MPIDR. It turns out to be slightly pointless: - On the host, this value is known as soon as we're scheduled on a physical CPU - In the guest, this value cannot change, as it is set by KVM (and this is a read-only register) The result of the above is that we can perfectly avoid the eager saving of MPIDR_EL1, and only keep the restore. We just have to setup the host contexts appropriately at boot time. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Christoffer Dall <christoffer.dall@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/kvm_host.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 4b6193f2f0f6..43e343e00fb8 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -26,6 +26,7 @@
#include <asm/kvm_asm.h>
#include <asm/kvm_mmio.h>
#include <asm/fpstate.h>
+#include <asm/smp_plat.h>
#include <kvm/arm_arch_timer.h>
#define __KVM_HAVE_ARCH_INTC_INITIALIZED
@@ -147,6 +148,13 @@ struct kvm_cpu_context {
typedef struct kvm_cpu_context kvm_cpu_context_t;
+static inline void kvm_init_host_cpu_context(kvm_cpu_context_t *cpu_ctxt,
+ int cpu)
+{
+ /* The host's MPIDR is immutable, so let's set it up at boot time */
+ cpu_ctxt->cp15[c0_MPIDR] = cpu_logical_map(cpu);
+}
+
struct kvm_vcpu_arch {
struct kvm_cpu_context ctxt;