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authorPaolo Bonzini <pbonzini@redhat.com>2019-08-09 16:53:50 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2019-08-09 16:53:50 +0200
commita738b5e75b4c13be3485c82eb62c30047aa9f164 (patch)
treef47fca53ee79938be283e13cf5d48def68f9dad2 /arch
parent0e1c438c44dd9cde56effb44c5f1cfeda72e108d (diff)
parent16e604a437c89751dc626c9e90cf88ba93c5be64 (diff)
download96b-common-a738b5e75b4c13be3485c82eb62c30047aa9f164.tar.gz
Merge tag 'kvmarm-fixes-for-5.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/arm fixes for 5.3, take #2 - Fix our system register reset so that we stop writing non-sensical values to them, and track which registers get reset instead. - Sync VMCR back from the GIC on WFI so that KVM has an exact vue of PMR. - Reevaluate state of HW-mapped, level triggered interrupts on enable.
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kvm/coproc.c23
-rw-r--r--arch/arm64/kvm/sys_regs.c32
2 files changed, 33 insertions, 22 deletions
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index d2806bcff8bb..07745ee022a1 100644
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -651,13 +651,22 @@ int kvm_handle_cp14_64(struct kvm_vcpu *vcpu, struct kvm_run *run)
}
static void reset_coproc_regs(struct kvm_vcpu *vcpu,
- const struct coproc_reg *table, size_t num)
+ const struct coproc_reg *table, size_t num,
+ unsigned long *bmap)
{
unsigned long i;
for (i = 0; i < num; i++)
- if (table[i].reset)
+ if (table[i].reset) {
+ int reg = table[i].reg;
+
table[i].reset(vcpu, &table[i]);
+ if (reg > 0 && reg < NR_CP15_REGS) {
+ set_bit(reg, bmap);
+ if (table[i].is_64bit)
+ set_bit(reg + 1, bmap);
+ }
+ }
}
static struct coproc_params decode_32bit_hsr(struct kvm_vcpu *vcpu)
@@ -1432,17 +1441,15 @@ void kvm_reset_coprocs(struct kvm_vcpu *vcpu)
{
size_t num;
const struct coproc_reg *table;
-
- /* Catch someone adding a register without putting in reset entry. */
- memset(vcpu->arch.ctxt.cp15, 0x42, sizeof(vcpu->arch.ctxt.cp15));
+ DECLARE_BITMAP(bmap, NR_CP15_REGS) = { 0, };
/* Generic chip reset first (so target could override). */
- reset_coproc_regs(vcpu, cp15_regs, ARRAY_SIZE(cp15_regs));
+ reset_coproc_regs(vcpu, cp15_regs, ARRAY_SIZE(cp15_regs), bmap);
table = get_target_table(vcpu->arch.target, &num);
- reset_coproc_regs(vcpu, table, num);
+ reset_coproc_regs(vcpu, table, num, bmap);
for (num = 1; num < NR_CP15_REGS; num++)
- WARN(vcpu_cp15(vcpu, num) == 0x42424242,
+ WARN(!test_bit(num, bmap),
"Didn't reset vcpu_cp15(vcpu, %zi)", num);
}
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index f26e181d881c..2071260a275b 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -632,7 +632,7 @@ static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
*/
val = ((pmcr & ~ARMV8_PMU_PMCR_MASK)
| (ARMV8_PMU_PMCR_MASK & 0xdecafbad)) & (~ARMV8_PMU_PMCR_E);
- __vcpu_sys_reg(vcpu, PMCR_EL0) = val;
+ __vcpu_sys_reg(vcpu, r->reg) = val;
}
static bool check_pmu_access_disabled(struct kvm_vcpu *vcpu, u64 flags)
@@ -981,13 +981,13 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
/* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
#define DBG_BCR_BVR_WCR_WVR_EL1(n) \
{ SYS_DESC(SYS_DBGBVRn_EL1(n)), \
- trap_bvr, reset_bvr, n, 0, get_bvr, set_bvr }, \
+ trap_bvr, reset_bvr, 0, 0, get_bvr, set_bvr }, \
{ SYS_DESC(SYS_DBGBCRn_EL1(n)), \
- trap_bcr, reset_bcr, n, 0, get_bcr, set_bcr }, \
+ trap_bcr, reset_bcr, 0, 0, get_bcr, set_bcr }, \
{ SYS_DESC(SYS_DBGWVRn_EL1(n)), \
- trap_wvr, reset_wvr, n, 0, get_wvr, set_wvr }, \
+ trap_wvr, reset_wvr, 0, 0, get_wvr, set_wvr }, \
{ SYS_DESC(SYS_DBGWCRn_EL1(n)), \
- trap_wcr, reset_wcr, n, 0, get_wcr, set_wcr }
+ trap_wcr, reset_wcr, 0, 0, get_wcr, set_wcr }
/* Macro to expand the PMEVCNTRn_EL0 register */
#define PMU_PMEVCNTR_EL0(n) \
@@ -1540,7 +1540,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
{ SYS_DESC(SYS_CSSELR_EL1), access_csselr, reset_unknown, CSSELR_EL1 },
{ SYS_DESC(SYS_CTR_EL0), access_ctr },
- { SYS_DESC(SYS_PMCR_EL0), access_pmcr, reset_pmcr, },
+ { SYS_DESC(SYS_PMCR_EL0), access_pmcr, reset_pmcr, PMCR_EL0 },
{ SYS_DESC(SYS_PMCNTENSET_EL0), access_pmcnten, reset_unknown, PMCNTENSET_EL0 },
{ SYS_DESC(SYS_PMCNTENCLR_EL0), access_pmcnten, NULL, PMCNTENSET_EL0 },
{ SYS_DESC(SYS_PMOVSCLR_EL0), access_pmovs, NULL, PMOVSSET_EL0 },
@@ -2254,13 +2254,19 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu,
}
static void reset_sys_reg_descs(struct kvm_vcpu *vcpu,
- const struct sys_reg_desc *table, size_t num)
+ const struct sys_reg_desc *table, size_t num,
+ unsigned long *bmap)
{
unsigned long i;
for (i = 0; i < num; i++)
- if (table[i].reset)
+ if (table[i].reset) {
+ int reg = table[i].reg;
+
table[i].reset(vcpu, &table[i]);
+ if (reg > 0 && reg < NR_SYS_REGS)
+ set_bit(reg, bmap);
+ }
}
/**
@@ -2774,18 +2780,16 @@ void kvm_reset_sys_regs(struct kvm_vcpu *vcpu)
{
size_t num;
const struct sys_reg_desc *table;
-
- /* Catch someone adding a register without putting in reset entry. */
- memset(&vcpu->arch.ctxt.sys_regs, 0x42, sizeof(vcpu->arch.ctxt.sys_regs));
+ DECLARE_BITMAP(bmap, NR_SYS_REGS) = { 0, };
/* Generic chip reset first (so target could override). */
- reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs));
+ reset_sys_reg_descs(vcpu, sys_reg_descs, ARRAY_SIZE(sys_reg_descs), bmap);
table = get_target_table(vcpu->arch.target, true, &num);
- reset_sys_reg_descs(vcpu, table, num);
+ reset_sys_reg_descs(vcpu, table, num, bmap);
for (num = 1; num < NR_SYS_REGS; num++) {
- if (WARN(__vcpu_sys_reg(vcpu, num) == 0x4242424242424242,
+ if (WARN(!test_bit(num, bmap),
"Didn't reset __vcpu_sys_reg(%zi)\n", num))
break;
}