From 2d7921c499afebac78b13ab9a3758261a97e07b7 Mon Sep 17 00:00:00 2001 From: Arbel Moshe Date: Mon, 12 Mar 2018 13:12:53 +0200 Subject: KVM: x86: Add support for VMware backdoor Pseudo-PMCs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit VMware exposes the following Pseudo PMCs: 0x10000: Physical host TSC 0x10001: Elapsed real time in ns 0x10002: Elapsed apparent time in ns For more info refer to: https://www.vmware.com/files/pdf/techpaper/Timekeeping-In-VirtualMachines.pdf VMware allows access to these Pseduo-PMCs even when read via RDPMC in Ring3 and CR4.PCE=0. Therefore, commit modifies x86 emulator to allow access to these PMCs in this situation. In addition, emulation of these PMCs were added to kvm_pmu_rdpmc(). Signed-off-by: Arbel Moshe Signed-off-by: Liran Alon Reviewed-by: Radim Krčmář Signed-off-by: Paolo Bonzini --- arch/x86/kvm/x86.c | 41 ++++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 17 deletions(-) (limited to 'arch/x86/kvm/x86.c') diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 291ad5375747..9e1496cb2345 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -5932,23 +5932,30 @@ static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r) static bool is_vmware_backdoor_opcode(struct x86_emulate_ctxt *ctxt) { - if (ctxt->opcode_len != 1) - return false; - - switch (ctxt->b) { - case 0xe4: /* IN */ - case 0xe5: - case 0xec: - case 0xed: - case 0xe6: /* OUT */ - case 0xe7: - case 0xee: - case 0xef: - case 0x6c: /* INS */ - case 0x6d: - case 0x6e: /* OUTS */ - case 0x6f: - return true; + switch (ctxt->opcode_len) { + case 1: + switch (ctxt->b) { + case 0xe4: /* IN */ + case 0xe5: + case 0xec: + case 0xed: + case 0xe6: /* OUT */ + case 0xe7: + case 0xee: + case 0xef: + case 0x6c: /* INS */ + case 0x6d: + case 0x6e: /* OUTS */ + case 0x6f: + return true; + } + break; + case 2: + switch (ctxt->b) { + case 0x33: /* RDPMC */ + return true; + } + break; } return false; -- cgit v1.2.3