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authorChristoffer Dall <christoffer.dall@linaro.org>2014-08-19 12:18:04 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2014-08-27 22:46:09 +0200
commit98047888bb9fd57734028c44ec17413ddd623958 (patch)
tree976048e835e2f88df23b73aad4e0591102ab8c6e /arch/arm/kvm/arm.c
parentKVM: Introduce gfn_to_hva_memslot_prot (diff)
downloadlinux-98047888bb9fd57734028c44ec17413ddd623958.tar.xz
linux-98047888bb9fd57734028c44ec17413ddd623958.zip
arm/arm64: KVM: Support KVM_CAP_READONLY_MEM
When userspace loads code and data in a read-only memory regions, KVM needs to be able to handle this on arm and arm64. Specifically this is used when running code directly from a read-only flash device; the common scenario is a UEFI blob loaded with the -bios option in QEMU. Note that the MMIO exit on writes to a read-only memory is ABI and can be used to emulate block-erase style flash devices. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm/arm.c')
-rw-r--r--arch/arm/kvm/arm.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 9f788ebac55b..ac306b4dbe1d 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -188,6 +188,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ONE_REG:
case KVM_CAP_ARM_PSCI:
case KVM_CAP_ARM_PSCI_0_2:
+ case KVM_CAP_READONLY_MEM:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO: