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authorVladimir Murzin <vladimir.murzin@arm.com>2016-09-12 17:49:24 +0300
committerChristoffer Dall <christoffer.dall@linaro.org>2016-09-22 14:22:21 +0300
commitacda5430bee4621f218391d0bcfbe4412adb3554 (patch)
treed279ce897d2666ca9481963dca9fc9aede6e85dd /arch/arm/kvm/coproc.c
parenta078bedf17c2e43819fea54bdfd5793845142e3a (diff)
downloadlinux-acda5430bee4621f218391d0bcfbe4412adb3554.tar.xz
ARM: KVM: Support vgic-v3
This patch allows to build and use vgic-v3 in 32-bit mode. Unfortunately, it can not be split in several steps without extra stubs to keep patches independent and bisectable. For instance, virt/kvm/arm/vgic/vgic-v3.c uses function from vgic-v3-sr.c, handling access to GICv3 cpu interface from the guest requires vgic_v3.vgic_sre to be already defined. It is how support has been done: * handle SGI requests from the guest * report configured SRE on access to GICv3 cpu interface from the guest * required vgic-v3 macros are provided via uapi.h * static keys are used to select GIC backend * to make vgic-v3 build KVM_ARM_VGIC_V3 guard is removed along with the static inlines Acked-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'arch/arm/kvm/coproc.c')
-rw-r--r--arch/arm/kvm/coproc.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index 1bb2b79c01ff..3e5e4194ef86 100644
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -228,6 +228,35 @@ bool access_vm_reg(struct kvm_vcpu *vcpu,
return true;
}
+static bool access_gic_sgi(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p,
+ const struct coproc_reg *r)
+{
+ u64 reg;
+
+ if (!p->is_write)
+ return read_from_write_only(vcpu, p);
+
+ reg = (u64)*vcpu_reg(vcpu, p->Rt2) << 32;
+ reg |= *vcpu_reg(vcpu, p->Rt1) ;
+
+ vgic_v3_dispatch_sgi(vcpu, reg);
+
+ return true;
+}
+
+static bool access_gic_sre(struct kvm_vcpu *vcpu,
+ const struct coproc_params *p,
+ const struct coproc_reg *r)
+{
+ if (p->is_write)
+ return ignore_write(vcpu, p);
+
+ *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.vgic_cpu.vgic_v3.vgic_sre;
+
+ return true;
+}
+
/*
* We could trap ID_DFR0 and tell the guest we don't support performance
* monitoring. Unfortunately the patch to make the kernel check ID_DFR0 was
@@ -361,10 +390,16 @@ static const struct coproc_reg cp15_regs[] = {
{ CRn(10), CRm( 3), Op1( 0), Op2( 1), is32,
access_vm_reg, reset_unknown, c10_AMAIR1},
+ /* ICC_SGI1R */
+ { CRm64(12), Op1( 0), is64, access_gic_sgi},
+
/* VBAR: swapped by interrupt.S. */
{ CRn(12), CRm( 0), Op1( 0), Op2( 0), is32,
NULL, reset_val, c12_VBAR, 0x00000000 },
+ /* ICC_SRE */
+ { CRn(12), CRm(12), Op1( 0), Op2(5), is32, access_gic_sre },
+
/* CONTEXTIDR/TPIDRURW/TPIDRURO/TPIDRPRW: swapped by interrupt.S. */
{ CRn(13), CRm( 0), Op1( 0), Op2( 1), is32,
access_vm_reg, reset_val, c13_CID, 0x00000000 },