From 7a036a6f670f63b32c5ee126425f9109271ca13f Mon Sep 17 00:00:00 2001 From: =?utf8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Fri, 30 Oct 2015 16:36:24 +0100 Subject: [PATCH] KVM: x86: add read_phys to x86_emulate_ops MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Tested-by: Laszlo Ersek Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/kvm_emulate.h | 10 ++++++++++ arch/x86/kvm/x86.c | 10 ++++++++++ 2 files changed, 20 insertions(+) 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 57b5f79aad08..a24bae0a83a2 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4089,6 +4089,15 @@ 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, @@ -4824,6 +4833,7 @@ 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, -- 2.11.0