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KVM: e500: track host-writability of pages

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Add the possibility of marking a page so that the UW and SW bits are
force-cleared.  This is stored in the private info so that it persists
across multiple calls to kvmppc_e500_setup_stlbe.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2025-01-08 16:21:38 +01:00
parent e97fbb43fb
commit f2104bf22f
2 changed files with 13 additions and 4 deletions
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2
arch/powerpc/kvm/e500.h
View File

@ -34,6 +34,8 @@ enum vcpu_ftr {
#define E500_TLB_BITMAP (1 << 30)
/* TLB1 entry is mapped by host TLB0 */
#define E500_TLB_TLB0 (1 << 29)
/* entry is writable on the host */
#define E500_TLB_WRITABLE (1 << 28)
/* bits [6-5] MAS2_X1 and MAS2_X0 and [4-0] bits for WIMGE */
#define E500_TLB_MAS2_ATTR (0x7f)

15
arch/powerpc/kvm/e500_mmu_host.c
View File

@ -45,11 +45,14 @@ static inline unsigned int tlb1_max_shadow_size(void)
return host_tlb_params[1].entries - tlbcam_index - 1;
}
static inline u32 e500_shadow_mas3_attrib(u32 mas3, int usermode)
static inline u32 e500_shadow_mas3_attrib(u32 mas3, bool writable, int usermode)
{
/* Mask off reserved bits. */
mas3 &= MAS3_ATTRIB_MASK;
if (!writable)
mas3 &= ~(MAS3_UW|MAS3_SW);
#ifndef CONFIG_KVM_BOOKE_HV
if (!usermode) {
/* Guest is in supervisor mode,
@ -244,10 +247,13 @@ static inline int tlbe_is_writable(struct kvm_book3e_206_tlb_entry *tlbe)
static inline void kvmppc_e500_ref_setup(struct tlbe_ref *ref,
struct kvm_book3e_206_tlb_entry *gtlbe,
kvm_pfn_t pfn, unsigned int wimg)
kvm_pfn_t pfn, unsigned int wimg,
bool writable)
{
ref->pfn = pfn;
ref->flags = E500_TLB_VALID;
if (writable)
ref->flags |= E500_TLB_WRITABLE;
/* Use guest supplied MAS2_G and MAS2_E */
ref->flags |= (gtlbe->mas2 & MAS2_ATTRIB_MASK) | wimg;
@ -303,6 +309,7 @@ static void kvmppc_e500_setup_stlbe(
{
kvm_pfn_t pfn = ref->pfn;
u32 pr = vcpu->arch.shared->msr & MSR_PR;
bool writable = !!(ref->flags & E500_TLB_WRITABLE);
BUG_ON(!(ref->flags & E500_TLB_VALID));
@ -310,7 +317,7 @@ static void kvmppc_e500_setup_stlbe(
stlbe->mas1 = MAS1_TSIZE(tsize) | get_tlb_sts(gtlbe) | MAS1_VALID;
stlbe->mas2 = (gvaddr & MAS2_EPN) | (ref->flags & E500_TLB_MAS2_ATTR);
stlbe->mas7_3 = ((u64)pfn << PAGE_SHIFT) |
e500_shadow_mas3_attrib(gtlbe->mas7_3, pr);
e500_shadow_mas3_attrib(gtlbe->mas7_3, writable, pr);
}
static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
@ -487,7 +494,7 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
}
local_irq_restore(flags);
kvmppc_e500_ref_setup(ref, gtlbe, pfn, wimg);
kvmppc_e500_ref_setup(ref, gtlbe, pfn, wimg, true);
kvmppc_e500_setup_stlbe(&vcpu_e500->vcpu, gtlbe, tsize,
ref, gvaddr, stlbe);
writable = tlbe_is_writable(stlbe);