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| author | Radim Krčmář <rkrcmar@redhat.com> | 2015-10-30 16:36:24 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-12-09 14:34:16 -0500 |
| commit | bead1229f821de2ec81b5d361e1750a8e564d248 (patch) | |
| tree | 071f1307901e778246c7c89bfa24eca13c1f73eb | |
| parent | ff3a8601b8a4be9932c714b59392900ecb10bc84 (diff) | |
| download | lwn-bead1229f821de2ec81b5d361e1750a8e564d248.tar.gz lwn-bead1229f821de2ec81b5d361e1750a8e564d248.zip | |
KVM: x86: add read_phys to x86_emulate_ops
commit 7a036a6f670f63b32c5ee126425f9109271ca13f upstream.
We want to read the physical memory when emulating RSM.
X86EMUL_IO_NEEDED is returned on all errors for consistency with other
helpers.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/include/asm/kvm_emulate.h | 10 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 10 |
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h index e16466ec473c..e9cd7befcb76 100644 --- a/arch/x86/include/asm/kvm_emulate.h +++ b/arch/x86/include/asm/kvm_emulate.h @@ -112,6 +112,16 @@ struct x86_emulate_ops { struct x86_exception *fault); /* + * read_phys: Read bytes of standard (non-emulated/special) memory. + * Used for descriptor reading. + * @addr: [IN ] Physical address from which to read. + * @val: [OUT] Value read from memory. + * @bytes: [IN ] Number of bytes to read from memory. + */ + int (*read_phys)(struct x86_emulate_ctxt *ctxt, unsigned long addr, + void *val, unsigned int bytes); + + /* * write_std: Write bytes of standard (non-emulated/special) memory. * Used for descriptor writing. * @addr: [IN ] Linear address to which to write. diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 9a9a19830321..ac10269bc25e 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4059,6 +4059,15 @@ static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt, return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception); } +static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt, + unsigned long addr, void *val, unsigned int bytes) +{ + struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); + int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes); + + return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE; +} + int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val, unsigned int bytes, @@ -4794,6 +4803,7 @@ static const struct x86_emulate_ops emulate_ops = { .write_gpr = emulator_write_gpr, .read_std = kvm_read_guest_virt_system, .write_std = kvm_write_guest_virt_system, + .read_phys = kvm_read_guest_phys_system, .fetch = kvm_fetch_guest_virt, .read_emulated = emulator_read_emulated, .write_emulated = emulator_write_emulated, |