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KVM: arm64: Only sign-extend MMIO up to register width

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On AArch64 you can do a sign-extended load to either a 32-bit or 64-bit
register, and we should only sign extend the register up to the width of
the register as specified in the operation (by using the 32-bit Wn or
64-bit Xn register specifier).

As it turns out, the architecture provides this decoding information in
the SF ("Sixty-Four" -- how cute...) bit.

Let's take advantage of this with the usual 32-bit/64-bit header file
dance and do the right thing on AArch64 hosts.

Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20191212195055.5541-1-christoffer.dall@arm.com
This commit is contained in:
Christoffer Dall 2019-12-12 20:50:55 +01:00 committed by Marc Zyngier
parent fd6988496e
commit b6ae256afd
5 changed files with 20 additions and 4 deletions
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5
arch/arm/include/asm/kvm_emulate.h
View File

@ -182,6 +182,11 @@ static inline bool kvm_vcpu_dabt_issext(struct kvm_vcpu *vcpu)
return kvm_vcpu_get_hsr(vcpu) & HSR_SSE;
}
static inline bool kvm_vcpu_dabt_issf(const struct kvm_vcpu *vcpu)
{
return false;
}
static inline int kvm_vcpu_dabt_get_rd(struct kvm_vcpu *vcpu)
{
return (kvm_vcpu_get_hsr(vcpu) & HSR_SRT_MASK) >> HSR_SRT_SHIFT;

2
arch/arm/include/asm/kvm_mmio.h
View File

@ -14,6 +14,8 @@
struct kvm_decode {
unsigned long rt;
bool sign_extend;
/* Not used on 32-bit arm */
bool sixty_four;
};
void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);

5
arch/arm64/include/asm/kvm_emulate.h
View File

@ -283,6 +283,11 @@ static inline bool kvm_vcpu_dabt_issext(const struct kvm_vcpu *vcpu)
return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SSE);
}
static inline bool kvm_vcpu_dabt_issf(const struct kvm_vcpu *vcpu)
{
return !!(kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SF);
}
static inline int kvm_vcpu_dabt_get_rd(const struct kvm_vcpu *vcpu)
{
return (kvm_vcpu_get_hsr(vcpu) & ESR_ELx_SRT_MASK) >> ESR_ELx_SRT_SHIFT;

6
arch/arm64/include/asm/kvm_mmio.h
View File

@ -10,13 +10,11 @@
#include <linux/kvm_host.h>
#include <asm/kvm_arm.h>
/*
* This is annoying. The mmio code requires this, even if we don't
* need any decoding. To be fixed.
*/
struct kvm_decode {
unsigned long rt;
bool sign_extend;
/* Witdth of the register accessed by the faulting instruction is 64-bits */
bool sixty_four;
};
void kvm_mmio_write_buf(void *buf, unsigned int len, unsigned long data);

6
virt/kvm/arm/mmio.c
View File

@ -105,6 +105,9 @@ int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
data = (data ^ mask) - mask;
}
if (!vcpu->arch.mmio_decode.sixty_four)
data = data & 0xffffffff;
trace_kvm_mmio(KVM_TRACE_MMIO_READ, len, run->mmio.phys_addr,
&data);
data = vcpu_data_host_to_guest(vcpu, data, len);
@ -125,6 +128,7 @@ static int decode_hsr(struct kvm_vcpu *vcpu, bool *is_write, int *len)
unsigned long rt;
int access_size;
bool sign_extend;
bool sixty_four;
if (kvm_vcpu_dabt_iss1tw(vcpu)) {
/* page table accesses IO mem: tell guest to fix its TTBR */
@ -138,11 +142,13 @@ static int decode_hsr(struct kvm_vcpu *vcpu, bool *is_write, int *len)
*is_write = kvm_vcpu_dabt_iswrite(vcpu);
sign_extend = kvm_vcpu_dabt_issext(vcpu);
sixty_four = kvm_vcpu_dabt_issf(vcpu);
rt = kvm_vcpu_dabt_get_rd(vcpu);
*len = access_size;
vcpu->arch.mmio_decode.sign_extend = sign_extend;
vcpu->arch.mmio_decode.rt = rt;
vcpu->arch.mmio_decode.sixty_four = sixty_four;
return 0;
}